GASTEROPODA. 309 



species. PLilippines, India, New Guinea, New Zealand, Pacific 

 Islands. 



Lomastoma* (cylindracenm), Guild. (Farcimen, Troseliel.) 

 Shell oblong or pupa-shaped, scarcely perforated, aperture 

 circular ; operculum thin, horny, many-whorled, flat. Distri- 

 hutio7i, 19 species. West Indies, Tropical America, Canaries, 

 India, Mauritius. Fossil, Eocene — . Paris and Isle of "Wight. 

 (E. Forbes.) 



Craspedopoma (lucidum), Pfr. Shell turbinate, rimate, a little 

 contracted near the aperture ; operculum round, horny, many- 

 whorled. Distribution, 3 species. Madeira, Palma. Fossil, 

 Eocene — . Isle of Wight, Madeira. 



Cataulus (tortuosus), Pfr. Shell pupa-shaped, with the base 

 keeled, producing a channel in the front of the aperture ; oper- 

 culum circular, horny, the whorls easily separable. Distribu- 

 tion, 6 species. Ceylon. 



Diplommatina (folliculus), Benson. Shell minute (1 species 

 sinistral), conical, with costulated whorls ; peristome double ; 

 operculum horny, multi-spiral. Distribution, 3 species. India. 



Opisthophorus, Benson, 1855. 0. biciliatus, Mouss. Shell 

 like Fterocydos ; operculum double, margin grooved, interior 

 concamerated. Distribution, 4 species. Singapore, Borneo^ 

 Java. 



Hybocystis, Benson, 1859. Shell distortedly o\ate; aperture 

 circular, interior peristome deeply notched. Operculum shelly, 

 thick, multi-spiral. 



PupiiSTA, Yignard. 



Type, P. bicanaliculata, Sby. PI. XII., Fig. 42. Australian 

 Islands. 



Shell sub -cylindrical, usually polished; aperture circular,, 

 peristome thickened, notched in front and at the suture ; oper- 

 culum membranous, narrow- whorled. P. grandis, Forbes, has 

 a dull epidermis. 



Distribution, 17 species. Philippines, New Guinea, New Ire- 

 land, Louisiades. 



Sub-genus, Rhegostoma (nunezii), Hasselt. Aperture with a 

 narrow channel in the middle of the columellar side. 6 species, 

 Philippines, Nicobar. In R. Lubricum (Callia, Gray) the sinus 

 is obsolete. R. pupiniforme (Pupinella, Gray) is perforated, 

 and has a dull epidermis. 



* Abridged from Megaloma- stoma ; Swainson, who judiciously curtailed several 

 preposterously long names, allowed this to remain. 



