es ~- 
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 Helicinide 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 Cyclophoride and a paucispiral oper- 
culum. For the present it may perhaps be best classed as a 
subfamily of the Helicinide equivalent perhaps to Stoastoma and 
its allies. 
| 
24, Ororpoma, Gray. 
A solitary species of this genus is found in Western India, 
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 Cyclostomide known to occur in India. O. dblennus, 
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 
the peninsula, and none are known to occur in Burma. 
25. Hexicrna, Lamarck. 
A species of this genus is found as far north as Ramri Island, 
on the coast of Arakan. It is very closely allied to 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. . 
possibly the excentric striation has been taken for paucispiral structure. 
I have not been able to examine H. dlex lately. 
