Beer 
GASTEROPODA. 267 
its inner side, and slightly so externally; operculum shelly, 
multi-spiral. . 
Distribution, 6 species. West Indies—China. Low water to 
60 fathoms. 
Fossil, 5 species. Tertiary—. Britain. 
EUOMPHALUS, Sowerby. 
Etymology, eu, wide, and omphalos, umbilicus. 
Synonyms, Schizostoma, Bronn. Straparollus, D’Orbigny. 
Ophileta, Vanuxem. Platyschisma, M‘Coy. 
Type, HK. pentagonalis. Pl. X., Fig. 18. 
Shell depressed or discoidal; whorls angular or coronated ; 
aperture polygonal; umbilicus very large; operculum shelly, 
round, multi-spiral. (Salter.) 
Fossil, 80 species, L. silurian—-Trias. North America, EKurope, 
Austraha. 
Sub-genus. Phanerotinus, J. Sby. 1840, HE. cristatus, Phil. 
Carb. limestone. Britain. 
Shell discoidal; whorls separate; outer margin sometimes 
foliaceous. 
STOMATELLA, Lam. 
Etymology, diminutive of stoma, the aperture. 
Type, 8. imbricata. Pl. X., Fig. 19. 
Shell ear-shaped, regular; spire small; aperture oblong, very 
large and oblique, nacreous; lip thin, even-edged; operculum 
eircular, horny, multi-spiral. On reefs and under stones at 
ow water. 
Distribution, 33 species. Cape, India, North Australia, 
China, Japan, Philippines. 
Sub-genus@ Gena, Gray. Spire minute, marginal; no. 
operculum. 16 species. Red Sea, India, Seychelles, Swan 
River, Philippines. (Adams.) 
Niphonia, Adams. 1 species, Japan. 
BRODERIPIA, Gray. 
Etymology, named in honour of W. J. Broderip, Hsq., the 
distinguished conchologist. 
Type, B. rosea. Pl. X., Fig. 20. 
Shell minute, limpet-shaped, with a posterior sub-marginal 
apex ; aperture oval, as large as the shell, brilliantly nacreous. 
Distribution, 3 species. Philippines; Grimwood’s Island, 
South Seas. (Cuming.) 
N 2 
