RISSOIA-RISSOIXA. 369 



E. SCHYTHEI, Phil. Sts. of Magellan. 



E. LJEVIGATA, E. MUCROXATA, E. TUBERCULATA, E. TRUNCATA, 



Menke, E. SCROBICULATA, Moll. Greenland. 



E. GRADATULA, E. EMACiATA, Morch. West Indies. 



E. CRASSICOSTA, E. EULiMOiDES, E. ABERRAxs, A. Ad. Jamaica. 



E. IXCOMPTA, Gould. Florida. 

 E. GEXTILISSIAXA, Sowb. (PI. 68, fig. 5). 



= Hydrobia Gentilsiana, Crosse. 



E. BICIXGULATA, and E. TENUICOSTATA, Seguenza. Messina. 



E. Boscn, Payr. Corsica. 



E. PUXCTUM, Cantraine. Mediterranean. 



E. WEYVILLE-THOMPSONI, Jeffreys. Arctic Ocean. 



E. PEDICULARIS, Menke. Heligoland. 



E. PRJEUSTA, Eecluz. Toulon. 



E. SUBSTRIATA, and E. EXIGUA, Phil. Sicily. 



E. DILECTA, Monts. Sicily. 



E. SCALARIS, Mich. = Truncatella. 



E. GOUGETI, Mich. Senegal. 



E. ELOXGATA, E. EXCAVATA, Phil. = Odostomia. 



E. EXIMIA, Jeffreys. = Odostomia. 



E. COOPERI, Tryon. Amnicolidai. 



Genus EISSOINA, d'Orb. 1840. 



Section EISSOINA (sensu stricto). 

 E. IXCA, d'Orb. PI. 55, fig. 15. 



Strong, stout, with about 17 elevated, suboblique, flexuous, longi- 

 tudinal ribs, and fine spiral striae, more prominent on the base; 

 whorls 7-8, nearly flat, suture crenulated; rosy white. 



Length 8'2 mill. 



Bolivia, Peru. 

 E. PYRAMIDALIS, A. Ad. PL 55 fig. 16. 



Solid, dirty white, longitudinally obliquely plicate, spirally striate, 

 whorls 8, flattened, suture crenulated. Length, 8*5 mill. 



Philippines. 

 E. ASSIMILIS, Jickeli. PI. 68, fig. 15. 



Shell solid, white, with 1011, straight, narrow, longitudinal 

 costae, and much wider interstices, which show slight, distinct spiral 

 str Jae ; whorls 8, slightly convex, with impressed suture ; lip scarcely 

 varicose. Length, 8'3 mill. 



Red Sea. 

 24 



