22 F. Stoliczka — Land-shelh qf Penang Island. [No. 1, 



branches off above this gland, it is fully one inch long, somewhat thickened 

 in the middle. The penis is attached by a short muscle, about 4 m.m. long 

 and moderately thickened. 



Teochomoepha Cantoeiana, {Benson). PL i, fig. 13. 

 Helix Cantoriana, Benson, Ann. and Mag. Nat, Hist., 1861, vii, p. 85. 



Five specimens which I found on Penang hill (at about 2000 feet 

 elevation) exactly correspond with Benson's description, which was taken 

 from a solitary specimen obtained by Dr. Cantor on the small island Sung- 

 Sung near Penang. The illustration given on plate i will dispense with a 

 repetition of the description quoted above. The apex is smooth, slightly 

 swollen, and there are scarcely more than five whorls in specimens of 10 m.m. 



The animal is blackish grey with a very narrow, pale dorsal stripe, 

 quite similar to that of T. castra, but by some accident no specimen was 

 preserved in spirit, so I cannot give any further details of its structure ; it is, 

 however, certainly a Trocliomo7y]ia. The specimens were found under a log 

 of old wood. 



Trochomoepha Timoeensis, Martens. PL i, fig. 17, and pi. ii, figs. 10-12. 

 E. V. Martens, in Preuss. Ost-Asiat. Exped., 1867, II, p. 248. 



Penang specimens, of which I obtained sixteen, entirely agree in form 

 and structure with the shell described by E. von Martens, with the single 

 exception that the last whorl is not descending near the aperture, but there 

 is an inclination to it, as its terminal portion in adult specimens is slightly 

 more bent downwards than the preceding part (comp. figs. Via and Vlh). 

 This character is, however, certainly a variable one ; it does also occasionally 

 occur in adult specimens of T. castra and T. planorhis. The differences 

 noticed by E. v. Martens regarding the greater number of whorls, and the 

 larger umbilicus, with less rapidly descending sides, in Timorensis, when 

 compared Wiih. planorhis, are well marked in Penang examples. 



The species is found sparingly on or under old wood all over Penang 

 hill ; T. planorhis was not met with there, but it is a very abundant shell at 

 the Nicobars. 



The animal is uniform blackish, mantle more intense black ; pedal row 

 distinct and the edge of the foot below it nearly quite smooth ; neck and 

 sides covered with small warts ; tail gland represented by a very fine slit, 

 scarcely more than half a millimetre long. 



The jaw and radula are quite similar to those of T. castra. The former 

 is about three quarters mill, broad, with somewhat curved out ends and a 

 broadly rounded central projection in the concave edge. The teeth are very 

 slender, and the lateral denticles are very close to the tip on the centre tooth. 

 The outer denticle descends a little lower down on the laterals, but it 



