TURBONlLLlDiE. 23*7 



Animal elongated, the head large and robust, bearing two 

 conical tentacles with eyes at their bases, foot depressed, trun- 

 cated in front. 



Very minute, usually smooth shells, having the habit of 

 Rissofe, and like them sometimes found in brackish water, 



PARTHENiA, Lowc, 1863. (Pyrgulina, A. Ad.) Shell thin, 

 turriculated, imperforate, usually milk-white under a very pale 

 thin epidermis ; whorls ribbed or striate, sometimes cancellate, 

 vanishing at the peripher}^ of the last whorl. 25 sp. Mazatlan, 

 Japan. 0. monocycla, A. Ad. 



MIRALDA, A. Ad., 1863. Solid, ovate or elongated; whorls 

 flat, plicate behind, transversely Urate in front; lip subangulate 

 behind, margin crenate. SeveralJapanese species. 0. diadema. 

 A. Ad. 



MUMiOLA, A. Ad., 1863. Shell thin, elongate or ovate; whorls 

 convex, cancellate or granulose. ; aperture ovate, lip-mai'gin 

 regularly arcuate. 3 Japanese species. 0. spif'ata, A. Ad. 



AURicuLiNA, G-ray. Shell oval, thin, bulimiform ; whorls smooth 

 or concentrically striate ; columella not plicate. 6 sp. Mazatlan, 

 Japan. Fossil, 4 sp. Tertiary ; U. S. 0. cylindracea^ Alder 

 (Ixviii, 6). May possibly be a member of the family Actseonidse. 



LiosTOMiA, Sars. Shell rimate, smooth ; operculum pauci- 

 spiral. 2 sp. Norway. L. eburnea, Stimpson (Ixviii, IT, 18). 

 Massachusetts. 



CHRYSALLiDA, Carpenter. Shell pupiforra, usually cancellated ; 

 peristome continuous ; edge of lip thin ; columella-plait distinct, 

 though hidden ; operculum in the typical species radiately cor- 

 rugated. 25 sp. E. and W. Indies, Japan, Mazatlan. 0. com- 

 munis^ C. B. Ad. (Ixviii, 1). 



DOLIELLA, Monts. Shell Doliiform,apex immersed. 



Pyramis, Couthouy. 



8yn. — Menestho,Moller. Type. — P. striatus, Gonth.. (Ixviii, 8). 



Shell turriculated or elongated, with revolving striae ; mouth 

 oval, small ; columella with a rudimentary plication, sometimes 

 obsolete. 



MONOPTYGMA, Gray (not Lea). Having a sinuous columellar 

 plication. P. casta, Ads. (Ixviii, 9). 



CARELioPSis, Morch. Shell turriculated, having the form of 

 Garelia Cumingii. 



OSCILLA, A. Ad. 



Distr. — 4 Japanese species. Obeliscus annulatus, A. Ad. 



Shell solid, ovate or pyramidally turreted ; imperforate ; whorls 

 strongly transversely lirate ; aperture ovate or subquadrate ; 

 parietal plication strong, transverse, median. 



Elusa, a. Ad., 1861. 

 Distr. — China, Japan. E. teres, A. Ad. 



