GASTEROPODA. 309 
species. Philippines, India, New Guinea, New Zealand, Pacific 
Islands. 
Lomastoma* (cylindraceum), Guild. (Farcimen, Troschel.) 
Shell oblong or pupa-shaped, scarcely perforated, aperture 
circular; operculum thin, horny, many-whorled, flat. Distri- 
bution, 19 species. West Indies, Tropical America, Canaries, 
India, Mauritius. fossil, Hocene—. Paris and Isle of Wight. 
(Ei. 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. O. biciliatus, Mouss. Shell 
like Pterocyclos ; operculum double, margin grooved, interior 
concamerated. Distribution, 4 species. Singapore, Borneo, 
Jaya. 
Hybocystis, Benson, 1859. Shell distortedly ovate; aperture 
circular, interior peristome deeply notched. Operculum shelly, 
thick, multi-spiral. 
PuPINA, Vignard. 
Type, P. bicanaliculata, Sby. Pl. 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. PP. 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 &. Lubricum (Callia, Gray) the sinus 
is obsolete. 2. 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, 
