cot; cno LOOT. 167 



Ar.Tc.ijns innnus, "W. Bl. Arakan Hills. Myanoung. 



Ingrami, W. lil. Arakan Uills. 



„ KcBZiANUs, Thuob. et Stol. Kattoung in Western Prome. 



„ MAUGAurrA, Tlicob. Upper Sahveen Valley. 



,, I'OLiTus, W. Bl. Phoungdo, near Cape Ncgrais. 



,, poLi-GoxoMA, W. Bl. Arakan Hills. 



,, ryuAMiuALis, B. Therapon Hill, Tenasserim. 



,, prsiLLCs, God.-Aus. Nattoung in Western Proiue. 



BiciiTiioi-ivXi, W. Bl. Kaugun and Farm Caves, Maulmain. 



,, succixEUS, W. Bl. Jloditourig, Arakan Hills. 



scFLPTiLis, B. Tondoung, near Thayet-niyo. 



,, TKNUi.A, B. Mail in Arakan. Attaran Valley. 



,, TMBOXALis, B. Akouktoung on tlui Irrawaddy K. 



,, YKsTmis, W. Bl. Moditoung. Baumi. Akyab. 



,, VuLCAXi, W. Bl. Puppadoung. 



Fmnihj Cyclostomiclss. 

 Omphaxoteopis, Pfeiffcr. 



Mr. W. T. Blanford, who has recently described three species of tliis genus, justly 

 remarks that it is unknown in India or Burma, being confined to the Islands, and is 

 especially common in the Mascarcnc Islands and in Polynesia. The shells are per- 

 forate, with an umbilical keel more or less distinct. 



,, DisTEUMlXA, B. Andamans. 



,, AxDKRsoxr, W. Bl. Andamans. 



,, PALLIDA, W. Bl. Andamans. 



„ nix-cssATA, W. Bl. Andamans. 



,, coNoiDEA, For. Nicobars. 



Family Helicinidse. 



HELICININiE. 

 llKLicrxA, Lamarch. 



Operculum lunate, shelly and devoid of spiral structure. The animals of this 

 genus possess the power, in common with the NerUidm and Anrimlidce, of dissolving 

 the internal or columella portion of their shells, thereby obtaining more room for the 

 comfortable disposition of their stomachs and other organs when adult. The species 

 are mostly insular or littoral in their distribution. 



,, Arakaxexsis, "W. Bl. Basscin. Eamri and Andamans. 



,, AxDAMANicA, B. Audamaus. Js^ieubars and Cocos. 



,, CRociNA, B. Toung-ngoo. 



,, Meeguiexsis, Pfr. Mergui. 



,, scEUPULUM, B. Andamans. 



,, DuxKEEi, Zel. Camorta. Preparis Island. 



,, BE^^^ANA, Pfr. Nicobars. 



,, NicoBARicA, Phil. Nicobars. 



This genus may be regarded as somewhat feebly represented on the mainland or 

 Burma proper; the species being small and the individuals not numerous. The finer 

 and more typical fonus are from the West Indies. 



HTDROCENINiE. 

 Hydeocexa, Parryess. 



The shells of this genus are minute, turbinate, and generally spirally striated, 

 and harbour under stones or adhere to rocks. Tlie operculum is shelly and furnished 

 ipteriorly with a slender spinc-likc process. 



,, Blanfordiaxa, Stol. Chouktalon and Farm Caves. 



„ FEUSTELLLUM, R. Mya-lcit-doung, Ava. 



