64 ONCIDIOPSIS. 



Subgenus Marsenina, Gra^-, 1850. 

 L. RHOMBiCA, Dall. PI. 26, figs. 24, 25. 



Pure white, subrhomboidal, moderateh' elevated, Miiorls 3 ; 

 columella thickened, stout, with a groove behind the callus ; 

 whorl appressed against and sliglitly flattened below the suture ; 

 spire ver}' small, not elevated ; aperture subquadrate, outer lip 

 very much produced above and below, suture deep ; surface 

 smooth. Length, 12 mill. 



Monterey^ Gal. 



Animal bluish translucent, white, the mantle only partially 

 covering the shell. ITntigured. 



L. GLABRA, Couthou}'. PL 26, figs. 2(;-2S. 



Thin, pellucid, white, smooth and shining, whorls two, the first 

 a mere nucleus, the aperture oval, very large. Length, 12 mill. 



Keio England to Greenland^ Norvmy. 



It is L. haliotoidea, Gould, not Linn.; L. micrompliala^ Bergh, 

 (tigs. 27, 28). 



L. Gr(ENLAND1CA, Moller. PI. 26, figs. 29, 30. 



Obliquely elevated, whorls 2, the last ver^^ large, whitish, 



shining. Length, 8 mill. 



Greenland^ Norioay. 



L. prodita, Loven. PI. 27, figs. 31, 32. 



More obliquely elevated than the preceding species, with 

 deeper suture, but perhaps only a varict}^ of it. 



Maine to Greenland. 

 L. AMPLA, Yerrill. PI. 27, figs. 33, 34. 



Inflated, subglobular, the spire not elevated. 



Eastport^ 3Iaine. 



Genus ONCIDIOPSIS (Beck), Bergh, 1853. 



0. GLACiALis, Sars. PI. 26, figs. 35, 36. 



Shell thin, h^^aline, slipper-shaped, flexible. Length, 16 mill. 

 Animal with a long, narrow foot ; the mantle subverrucose, ash- 

 colored, maculated with brown. 



Norway. 



