Cyclophorus malayanus (Benson, 1852)
“Ordinarily the shell is smooth, exhibiting only the usual finer and stronger striae of growth, but the pale brown and thin cuticle when well preserved is spirally striated, the striation being more conspicuous in younger shells than in more adult ones. Yound specimens of only two or three volutions have very conspicuous transversely oblique cuticular striae, and in this stage the shell with its angular last whorl perfectly resembles Pfeiffer’s Cyclostoma (Leptopoma) birmanum, which is no doubt either a young of the present species or of C. siamensis. Nearly all young Cyclophori have these transverse filiform striae of the cuticle. When larger the shell scarcely differs from of C. cantori, Benson, of which figures are given by Pfeiffer in Chemnitz’ Conch.-kab., and also by Reeve. I have not obtained in Penang any such small specimens with fully developed lips as are represented in those figures, but I have observed that the usual difference of the male being often slightly smaller than the female also exists in the present species, and an illustration of a nearly full grown male comes very close to that of Reeve. Judjing from the difference observed in the size of the sexes of other species, as is for instance very often the case in C. pearsoni, I am inclined to the opinion that the specimens described as C. cantori are males of C. malayanus, the latter being females. If this were the case, the former name would have priority over the latter, but even if the explanation of sexes would not in this case hold good, I believe that the form described as cantori can scarcely be looked upon as anything else than a smaller race of malayanus and vice versa. The animal is grey, darker on the head, brownish on the tentacles, pale towards the tip of the rostrum and at the basal edges of the foot. What Hanley figures, in Conch. Indica, pl. xlviii, fig. 4, as C. malayanus from the Shan States, has, I believe, nothing to do with the Penang shell, though it may represent a variety of siamensis, or a peculiarly depressed one of flavilabris, but it is impossible to form a good idea of the character of the species from the insufficient illustration given.” (Stoliczka, 1872)
“Observations - Cette espèce est très variable de coloration et de forme. Il en existe une variété très petite présentant les memes caractères que la grande et qui ne peut en être séparée. Les dimensions maxima et minima de cette espèce, telle que je l'ai trouvée moi-même dans la péninsule, sont les suivantes: Variété α -Diamètre, 55 mm; hauteur, 35 mm; diamètre de l'ouverture, 28 mm. Variété β - Diamètre, 42 mm; hauteur, 27 mm; diamètre de l'ouverture, 18 mm.” (Morgan, 1885)
“This shell, collected by Dr. Cantor, is one of the group which contains C. pearsoni, siamense, tuba, &c. The peculiarly flattened double peristome will at once serve to distinguish it from any of the allied species. The colouring also is of a particularly sober character.” (Benson, 1852)
“Quand elle est jeune, cette coquille présente un péristome simple et tranchant, tandis que dès qu'elle arrive à l'état adulte elle refléchit le bord de son ouverture qui s'épaissit avec le temps ef finit par se transformer en un bourrelet très épais sur lequel les lignes d'accroissement sont fortement marquées.” (Morgan, 1885)
Benson (1852) original descriptions on Cyclostoma malayanum – “Testa depresso-turbinata, laevigata, spiraliter exilissxme obsolete striata, supra castanea, albido undulatim strigata, interdum plurifasciata, subtus albida, castaneo anguste fasciata, infra periphaeriam fascia latiuscula saturata, albido sparse articulata, ornata; spira exsertiuscula, apice acutiuscula; anfractibus quinque subconvexis, ultimo rotundato, subtus convexo; apertura vix obliqua, magna, circulari, albida; peristomate duplicato, leviter adnato, externo plane expanso, superne arcuato, labio angusto; umbilico mediocri, pervio, subperspectivo.”
Kobelt (1902) descriptions on Cyclophorus (Salpingophorus) malayanus – “Schale mittelweit und fast durchgehend genabelt, niedrig kreiseiförmig, glatt, mit sehr schwachen Spirallinien, oben kastanienbraun mit weissen Striemen, mitunter gebändert, unten weiss mit einer kastanienbraunen, weiss gesprenkelten Binde unter der Mitte und mehreren feinen Spirallinien; Gewinde ziemlich hoch, Apex spitz; 5 massig gewöjbte, rasch zunehmende Windungen, letzte abgerundet; Mündung wenig schräg, weit, fast kreisrund, innen weiss; Mundrand doppelt: innerer zusammenhängend, kurz angewachsen, äusserer flach ausgebreitet.”
Cyclostoma malayanum – “Diam. major 43, minor 32, axis 29 mill.” (Benson, 1852); Cyclophorus (Salpingophorus) malayanus – “H. 21-24, Durchm. 37-42:28-32 mm.” (Kobelt, 1902)
Type locality – “in montibus vallibusque Insularum Penang et Lancavi, necnon in Peninsula Malayana.” leg. T. Cantor (Benson, 1852)
Other localities – “Penang” (Stoliczka, 1872); “de Pérak et de Patani” (Morgan, 1885)
“J'ai rencontré cette espèce dans toute la péninsule Malaise, elle est d'ailleurs très abondante si l'on en juge par le grand nombre de spécimens morts que l'on rencontre dans les plantations malaises de Pérak et de Patani.” (Morgan, 1885)