Chloritis penangensis (Stoliczka, 1873)
“As regards the thin, almost horny, fulvous, thickly and finely setose structure of the shell, this species is probably most closely allied to T. erinacea, Pfr., but it differs from it, as well as from two other very similar forms, T. quieta, Reeve, and T. euctoma, Pfr., by its conspicuously more elevated spire. Other species of similar type, like T. breviseta, Pfr., from Siam, T. helferi, Bens., from Andamans, and four or five others described by Pfeiffer and E. v. Martens have nearly all a more depressed form and mostly sub-angular last whorl, although their spire is somewhat elevated.” (Stoliczka, 1873)
“A comparison of the genital organs with those of Trachia delibrata, represented in J. A. S. B., vol. XL, Pt. II, 1871, pl. xvi, fig. 1, will shew, that the only essential difference consists in the presence of the small caecal appendage on the penis in T. penangensis. The jaw has fewer and less strong ribs, than that of the former species, but the teeth themselves are extremely similar.” (Stoliczka, 1873)
“A second species of Trachia, of which only a few dead examples were found at Buket Pondong, is smaller, the whorls increase more regularly and the last one is not so prominently large; the spine is a little more prominent, the angle round the umbilicus much more obtuse. This is perhaps Trachia penangensis, Stol.” (Möllendorff, 1886)
Stoliczka (1873) original descriptions on Trachia penangensis – “T. suborbiculata, alta, spira breviter elevate, obtuse, modice sed profunde umbilicata, tenui, fere cornea, cuticula luteo-fusca dense et breviter pilosa induta, unicolore; anfractibus 4.5, convexis, sutura profunde subcanaliculata junctis, ultimo ad peripheriam uniforme convexo, ad aperturam Paulo descendente, ad merginem umbilici obtuse angulato; epertura semilunari, labio tenui, labro expanso atque reflexo, ad insertionem umbilicalem paululum dilatato, ad basin indistincte subangulato, pallide violaceo tincto.”
“The animal is dark chocolate brown, with a very narrow pale dorsal and caudal stripe, the body is laterally somewhat more blackish in front, and tinged brownish behind; the posterior end of the foot is the shorter one, as in Trochomorpha, although not to the same extent.” (Stoliczka, 1873)
“The jaw is quadrant shaped, with about six strong ribs, an one or two less distinct ones on either side; it is 1.3 mm broad. The radula is about 2.5 mm long., and 1 mm broad; there are 95 transverve rows, and 91 teeth in each of them, decreasing in size the more they approach the edges. The centre tooth is slightly smaller than the first laterals. All have a large basal plate, which is on the centre tooth slightly emarginated in the middle of the upper edge; this emargination increases in depth on the laterals, the inner branch remaining smaller, until on the last ones the upper edge becomes represented by two obtuse branches. The hook is on all teeth comparatively small, broad, with a moderately sharp point. On about the tenth tooth a small denticle appears to shew on the outer edge near the tip, becoming more distinct on the following teeth. After the eighteenth lateral, the teeth become somewhat more rapidly shorter, but increase in width until the last are wider than long, or high, and on these the basal plate has almost entirely become obsolete.” (Stoliczka, 1873)
“The genital organs are more than an inch long. The female portion has a long seminal receptacle, strongly thickened and muscular for some distance from its origin, then passing into a long thin tube and terminating with a moderately enlarged bubble, attached by a very thin muscular fibres to the albuminous gland which is situated at the end of the uterus; it is attached by numerous thin threads at the upper end of the uterus; it is attached by numerous thin threads at the hermaphrodite opening, an after a short distance enlarge into a muscular tube. At the beginning of this enlargement is a short pointed flagellum, and at the other end, where the penis begins, is a retractor muscle. The penis itself has near its base a caecal appendage, its terminal portion, before it joins the hermaphrodite opening, is very thin.” (Stoliczka, 1873)
Trachia penangensis – “Diam. Maj. 16, diam. Min. 14.5, lat. Aperturae cum perist. 8.8, ejusd. Alt. 8.2 mm.” (Stoliczka, 1873)
Type locality – “Penang” (Stolizcka, 1873)
Other locality – “royaume de Pérak” (Morgan, 1885)
“Cette espèce est très abondante dans tout le royaume de Pérak. Je l'ai rencontrée en grand nombre dans la province Wellesley, la vallée de Kinta, elle vit dans les broussailles et les rizières sèches.” (Morgan, 1885)