464 Mr. W. T. Blanford on the Classification of 



G. Rawesiana, Bens. Molmain. 

 - G. sarrita, Bens. Khasi Hills. 

 And perhaps 



Hydrocena milium, Bens. Khasi Hills. 



H. tersa, Bens. Khasi Hills. 

 • As regards the position to be assigned to this genus amongst 

 the operculated land- shells, it will be observed that it differs 

 widely, in the important character of the form of the tentacles, 

 from all other genera belonging to the Cyclostomacea ; while its 

 operculum agrees with that of the Helicinid<e in the absence of 

 spiral structure and of form. It must evidently be separated 

 widely from Hydrocena and Omphalotropis, which have the 

 normal tentacles of the Cyclophoridae, and a paucispiral oper- 

 culum. For the present it may perhaps be best classed as a 

 subfamily of the Helicinidce equivalent perhaps to Stoastoma and 

 its allies. 



24. Otopoma, Gray. 



A solitary species of this genus is found in Western India, in 

 Kattiawar, in a climate which shows a slight approximation to 

 that of Persia and North-east Africa, being on the verge of the 

 area of the periodical rains of India and South-east Asia. This 

 species has been assigned to O. clausum, Sow., of Socotra and 

 Arabia; but a comparison of specimens from Kattiawar with 

 the original types of that shell in Mr. Cuming's collection has 

 convinced me that they are distinct. The Indian form is much 

 smoother, with a less excavated umbilical region, and a higher 

 spire ; and I propose to distinguish it as O. Hinduorum. 



I had long supposed that this species was the only representa- 

 tive of the Cyclostomidce known to occur in India. 0. blennvs, 

 Bens., from Molmain, has been since shown by its describer, Mr. 

 Benson, to have been founded in error; and O. spurcum, Grat., 

 is doubtless a species of Cyclotopsis. The discovery of the true 

 character of Cyclotopsis semistriata, Sow., proves that repre- 

 sentatives of the family are found throughout India, but only in 

 the peninsula, and none are known to occur in Burma. 



25. Helicina, Lamarck. 

 A species of this genus is found as far north as Ramri Island, 

 on the coast of Arakan. It is very closely allied io H. Anda- 

 manica, Bens., from the Andamans, and more remotely to the 

 Tenasserim H. Merguiensis, Pfr., and is the most westerly repre- 

 sentative of the genus yet met with in Asia. 



r)ssibly the excentric striation has been taken for paucispiral structure, 

 have not been able to examine H. illex lately. 



