TURBONILLID. I37 
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 
Rissoz, and like them sometimes found in brackish water. 
PARTHENIA, Lowe, 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 periphery of the last whorl. 25 sp. Mazatlan, 
Japan. O. monocycla, A. Ad. 
MIRALDA, A. Ad., 1863. Solid, ovate or elongated; whorls 
flat, plicate behind, transversely lirate in front; lip subangulate 
behind, margin crenate. Several Japanese species. O.diadema. 
Ao Ad: 
MumionA, A. Ad., 1863. Shell thin, elongate or ovate; whorls 
convex, cancellate or granulose; aperture ovate, lip-margin 
regularly arcuate. 38 Japanese species. 0. spirata, A. Ad. 
AURICULINA, Gray. Shell oval, thin, bulimiform ; whorls smooth 
or concentrically striate ; columella not plicate. 6sp. Mazatlan, 
Japan. Fossil, 4 sp. Tertiary; U.S. 0. cylindracea, Alder 
(ixviii, 6). May possibly be a member of the family Actzonide. 
Liostom1A, Sars. Shell rimate, smooth; operculum pauci- 
spiral. 2sp. Norway. JL. eburnea, Stimpson (xviii, 17, 18). 
Massachusetts. 
CHRYSALLIDA, Carpenter. Shell pupiform, usually cancellated ; 
peristome continuous; edge of lip thin; columella-plait distinct, 
though hidden; operculum in the typical species radiately cor- 
rugated. 25 sp. EK. and W. Indies, Japan, Mazatlan. O. com- 
munis, C. B. Ad. (1xviil, 7).. 
DOLIELLA, Monts. Shell Doliiform, apex immersed. 
Pyramis, Couthouy. 
Syn.—Menestho,Moller. Type.—P. striatus, Couth. (1xviii,8). 
Shell turriculated or elongated, with revolving strive; mouth 
oval, small; columella with a rudimentary plication, sometimes 
obsolete. 
MONOPTYGMA, Gray (not Lea).. Having a sinuous columellar 
plication. P. casta, Ads. (Ixviii, 9). 
CAREL!opsis, Morch. Shell turriculated, having the form of 
Carelia Cumingit. 
Oscitia, A. Ad. 
Disir.—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. 
Exusa, A. Ad., 1861. 
Distr.—China, Japan. E. teres, A. Ad. 
