CLASS GASTROPODA 
143 
Inside polished, white, the anterior terminations of the muscle-scar a little 
behind the apex. Edges of shell level, narrowly bordered with gray, es¬ 
pecially in the young. (Tryon and Pilsbry, Manual of Conchology .) 
Type in Academy, St. Petersburg. Type locality, Okhotsk Sea. 
Range. Icy Cape, Arctic Ocean, Okhotsk Sea, Shantur Island, For¬ 
rester Island, Alaska, to Puget Sound, Washington. 
Lepeta caecoides Carpenter, 1865 
Proceedings, Philadelphia Academy of Natural Sciences, 60. 
L. t. L. caecae simili; t. alba, ancyloidea, tenui, juniore subdiaphana; 
apice obtuso, antice verso; parte postica parum excurvata; lateribus baud 
compressis; margine regulariter ovato; tota superficie sublente minutissime 
striata, striulis valde distantibus, haud elevatis, haud granulatis, subobso- 
letis; cicatrice musculari haud impressa. Long. (t. adolesc.), .45; lat., .37; 
alt., .19 (speciminis multo majoris pars solum superest: long., .94; lat., 
.73; alt., .55). (Carpenter.) 
Shell like L. caecae ; with white, thin ancyloid shell, in youth subdiaph- 
anous; with obtuse apex, turned toward the front; the hinder part little 
excavated; with sides not compressed, with margin regularly ovate; the 
whole surface gently and very minutely striate, with striae strongly distant, 
not elevated, not granulated, subobsolete; with muscle-scar not impressed ; 
(of much the larger specimen only a part remains). 
Type in ? Type locality, Puget Sound. 
Range. Arctic and Bering Seas to Hakodate, Japan, the Aleutian 
Islands, south to the Farallon Islands, California. 
Lepeta alba Dali, 1869 
American Journal of Conchology, 5:145; Pi. 15, figs. 3, a-d. 
Shell pure white, smooth, or with extremely faint striae; solid; interior 
pure white, apex anteriorly directed, inconspicuous; shell arcuate before 
and behind. Length of adult, .96; width, .70; alt., .40 in. (Dali.) 
Type in Smithsonian Institution. Type locality, Seniavine Strait. 
Range. Bering Strait and Sea south to Straits of Juan de Fuca. 
Described as Cryptobranchia alba Dali. 
Lepeta alba instabilis Dali, 1869 
American Journal of Conchology, 5:145; Pi. 15, fig. 6. 
Shell patelliform, depressed, broad, smooth or lightly striate (young). 
Apex inconspicuous, in the anterior fourth. Sculpture in the adult only 
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