the Cyclostomacea of Eastern Asia. 463 
eity,—all which contrast strongly with the polished unbroken 
surface and delicate translucent shells of the Pupina group. 
But, as above mentioned, the genus Raphaulus shows, in some 
of these characters, a tendency to a passage. 
22. Pomartas, Studer. 
Two species of Indian shells have been described by Mr. Ben- 
son, and attributed to this South-European genus, viz. :— 
P. Himalaye, Bens., from near Darjiling. 
P. (Bulimus) pleurophorus, Bens. Khasi Hills. 
A third species has recently been obtained by Mr. Theobald 
from Arakan. 
These species agree well in general form and in sculpture 
with the European members of the genus. Some slight differ- 
ences, however, in the characters of the peristome and of the 
operculum may be sufficient to entitle the Indian forms to sec- 
tional or even subgeneric distinction. 
23. Hyprocena, Parreyss. 
Several minute forms from the Khasi Hills and Burma have 
been described by Mr. Benson as belonging to this genus. They, 
however, prove, on examination of the animal and operculum, 
to differ so widely from the type, that I propose to distinguish 
them as a new genus, probably belonging to a distinct family. 
GEORISSA, Noy. gen. 
Testa imperforata v. vix perforata, minima, conica, succinea v. 
rubella, plerumque spiraliter sulcata v. striata. 
Opere. semiovale, sine ullo vestigio structure spiralis, excentrice 
striatum, testaceum, transparens. 
Animal parvum, lobis hemispheericis in loco tentaculorum munitum. 
Oculi normales. Pes brevis, rotundatus. 
Type, G. pyxis, Bens., sp. 
The species of which I have examined the animal is the little 
G. pyxis, Bens., from the neighbourhood of Thayet Myo in Pegu, 
where it abounds, adhering to limestone rocks. It is found, in 
similar localities, throughout the region of Pegu west of the 
Irrawaddy. All the other species, so far as I am aware, also 
occur in the neighbourhood of limestone; G. frustillum, Bens., 
from the vicinity of Ava, certainly does so. The operculum of 
the last-mentioned species I have also examined, and found it to 
be precisely similar to that of G. pyzis. 
The other species which may be referred to this genus are 
G. illex *, Bens. Tenasserim. 
* The operculum of Hydrocena illex is described as paucispiral. In 
these very minute shells it is so difficult to examine the opercula, that very 
