Sinoennea perakensis (Godwin Austen & Nevill, 1879)
“I know of no shell which surpasses it in interest, as regards sculpture: the apical two whorls are smooth, the next closely, transversely sulcated, and the last two very conspicuously distantly so, the “sulci" are almost upright, only slightly flexuous, with their interstices about twice as broad as themselves; underneath, the base appears beautifully fimbriated near the margin, owing to these sulcations apparently suddenly stopping a short distance from the periphery, though in reality one can trace them across the base; but to do so requires the lens and a good light. To all appearance the middle of the base is smooth, polished and shining. These sulcations appear again within the deep, open, and solariform umbilicus, as conspicuous as ever. The characters of the aperture &c. are so excellently represented in Colonel Austen's figure, that it would be a waste of time to further describe them (6?. N.).” (Godwin-Austen & Nevill, 1879)
“Dr. Townsend found two apparently immature specimens of an Ennea at Bukit Pondong, which the late Mr. G. Nevill considered to be full-grown and to the type of a new subgenus of Ennea. Col. Godwin-Austen, however, deemed it best, considering only two specimens were found and that these were so similar in general form to immature specimens of Ennea stenopylis, Ben., from the Khasi Hills, not to found this new shell was a mature form. The results of Mr. Hungerford’s investigations have justified Col. Godwin-Austen’s caution. He found this Ennea in different stages of maturity, some entirely corresponding to the figure above quoted, but also some full-grown.” (Möllendorff, 1886)
“The other teeth which immature specimens show on the columella and in the palate, disappear in the full-grown shell. The analogy with E. stenopylis, Bens., pointed out by Godwin-Austen, exists also in full-grown specimens. E. perakensis is, however, a little longer, more cylindrical, the costulation more distant, and the ribs higher and less arcuate. Our species as well as the following one belongs to the group of Indian and Chinese species for which the late Mr. Nevill has founded the subgenus Martensia. This name has, however, been pre-occupied by Semper (landsch-Philipp., I, 1870, p. 42) for a genus of the Zonitidae, type Nanina mossambicensis, Pfr.” (Möllendorff, 1891)
“In the remarks on the name of the subgenus to which this species belongs, I have committed the error of writing Martensia, Nevill, instead of Nevillia, Martens. The latter name has been given by Prof, von Martens to a group of Mascarene Enneas (Beitr. Faun. Maur. 1880), but it was preoccupied by H. Adams (P. Z. S. 1868, p. 289) for a genus of the Rissoidae. The group, which comprises a number of Indian, Chinese, and Mascarene species, I have renamed Microstrophia (Jahrb. deutsch. malakoz. Ges. xiv. 1887, p. 22). The Perak species is closely allied to E. stenopylis, Bens.” (Möllendorff, 1886)
“As Peile (1929, p. 154) already pointed out the dentition of immature shells of S. perakensis consists of four teeth, differently shaped and differently arranged from the teeth in adult shells. The shell of S. perakensis from the Skeat Expedition (Collinge, 1902), labelled “Caves near Biserat, State of Patani, Skeat Expedition” is preserved in the Zoological Museum of Cambridge, MacAndrew Collection. The shell is in rather bad condition and little can be said on its identity.” (Benthem-Jutting, 1961)
Godwin-Austen & Nevill (1879) original descriptions Ennea perakensis – “Testa parva, viridescenti-crystallina, nitida, solida; spira paululum elevata, trochiformis, profunde et aperte umbilicata in modo "solariformi" dicto, apice obtuso atque Iaevi; superne elegantissime regulariterque transversim sulcata, sulcis pervalidis, planiusculis subrectisque (vix flexuosis); anfractu tertio sulcis confertis, ultimis duobus sulcis aequalibus atque distantibus ornatis; subtus ad basin subplana, circa umbilicum subcarinata, prope peripheriam sulcis validis subito fere evanidis, in umbilico rursus conspicue patentibus; anfract. 5, convexiusculi, ultimo basi plano; apertura perfecte quadrangularis, dentibus 4 coarctatis, dente Parietali percrasso, oblique contorto, conspicue prominente; perist. album, incrassatum, marginibus subparallelis, fere rectis, margine externo inferne dente parvo munito et ad basin abrupte angulato, margine basali cum dente, paululum majore, in medio munito, margine columellari superne callositate levi ad dentem parietalem juncto, reflexo et paululum obliquo, inferne acute angulato et dente valido munito.”
Möllendorff (1886) descriptions on Ennea perakensis – “Testa aperte perforate, cylindraceo-claviformis, solidula, nitida, viridescenti-crystallina, anfr. 2 apicales fere glabrati, tertius confertim costulatus, reliqui 4 ½ costulis validis, planiusculis, subdistantibus, paullum arcuatis sculpti, ultimus penultimo angustior, circa umbilicum valde compressus, obtuse carinatus, antice substrangulatus, scrobiculatus. Apertura fere verticalis, rotundato-tetragona, peristoma latiuscule expansum, albolabiatum, margine externo ad insertionem subito attenuato, sinuato. Lamella parietalus valida usque ad marginem producta, callo dentiformi in palato opposito.”
Benthem-Jutting (1961) descriptions on Sinoennea perakensis – “Shell ovoid-cylindrical, with blunt top. Glassy white, transparent, shining, with numerous equally spaced transverse ribs, about 45-48 on the last whorl. Two top whorls smooth. Just behind the peristome about 4-5 ribs are standing closer together. No spiral striation. Whorls 6-7, rounded in the first 4 whorls, more flattened in the later whorls. In the two last whorls the greatest diameter lies somewhat above the middle, giving the whorls a slightly “shouldered” appearance. At a short distance (about ¾ mm.) from the peristome the last whorl is somewhat compressed laterally, then widening again. Suture well impressed. Umbilicus open, wide. Aperture almost vertical, quadrangular, with rounded angles, the basal part somewhat receding. Peristome free from the last whorl. Continuous, thickened and reflected, with a distinct flexure at the parieto-angular corner, projecting interiorly as a rather high ridge. Palatal teeth two, the lower one more interiorly than the upper one. The lower one corresponds with a pit on the exterior of the shell behind the peristome. At the columellar side a broad fold lies deep in the throat.”
Ennea perakensis – “Alt. 1 3/5, diam. 2 mill. The other specimen measures, alt. 1½, diam. 1½ mill.” (Godwin-Austen & Nevill, 1879); Ennea perakensis – “Long. 4, diam. 2 mill.” (Möllendorff, 1886); Sinoennea perakensis – “Dimensions: Height 4.0-4.6 mm; Width 1.9-2.1 mm; Height of aperture 1.4-1.6 mm.” (Benthem-Jutting, 1961)
Type locality – “Buket Pondong cave” Leg. Dr. Townsend (Godwin-Austen & Nevill, 1879)
Other localities – “Caves near Biserat, State of Jalor”? (Collinge, 1902)