160 F. Stolkzka — Notes on terrestrial Mollusca. [No. 2, 



restricted to the head ; the anterior part of the body is always 

 long, extensible, and the posterior short ; the peduncles are long, 

 subcylindrical, but the tentacles much shorter, exactly as in the 

 Helicid^e. The mantle is thickened, generally with a short lobe, 

 or a thickening, on each side of the pulmonary orifice. The 

 internal organisation closely corresponds with that of the Helichxe, 

 except that the oesophagus is below produced in a tough cylindrical 

 tube, which contains the radula in the form of a narrowly curved 

 sheath ; the tube is attached by a special strong muscle to the re- 

 tractor of the body (see pi. viii, fig. 2). The teeth of the radula are 

 very simple, subconical, pointed, from 40-60 in each transverse 

 row. A special jaw is, as far as observations have been made, not 

 developed. 



All the species which I have observed were found under stones, 

 or trees, and old wood, or under dead leaves and other organic sub- 

 stances. Whether, or not, the species are carnivorous, as stated by 

 Gray, I have not been able to verify. They are oviparous, like the 

 Bulimi. 



Considering the form of the teeth, the Stkeptaxid,e are closely 

 allied to the Testacellid^e, next to which they are also classed by 

 Gray. Both families agree in the great length of the anterior part 

 of the body and in the more or less secluded habitat. But upon 

 inspection of the anatomy of Testacella, as given by Cuvier, I fail 

 to notice the peculiarity of the long cylindrical tube containing the 

 radula ; this appears to be a good reason for accepting Gray's classi- 

 fication of Testacella, with Daudebardia, in a separate family. A 

 third group containing some of the anatomical characters of 

 Streptaxis is represented by Glandina, but Cijlindrelta and its allies 

 belong to the Helicid^;, as lately shewn by Crosse and Fischer. 



Stkeptaxis, Gray. 



This genus characterizes in India the Malayan fauna, most of the 

 species being found either on the higher hills of South India, or in 

 North-Eastern Bengal, and from thence southwards through the 

 whole of Burma and the Tenasserim provinces. The greater number 

 of the species, occurring in this extensive zoological province, 

 are distinguished by a single parietal plait in the aperture, only 



