344 PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 

 Schizoplaz brandtii Dall ex Mii>d. 



Not uncommon and of rather large size ; from Bering Island. Col- 

 lector's numbers, 1456, 1497, and 2465. Mus. Cat. 40919. Also dry 

 specimens from the beaches. 



Cryptochiton stelleri Gray aad Midd. 



Dead valves were picked up on the beaches which were of a much 

 more reddish color than usual in this species. Collector's number, 2567. 

 Mus. Cat. 40920. 



Conchophora. 



Acmaea pelta Eschscholtz. 



Prom Copper Island, collector's number, 1007, Mus. Cat. 40921; and 

 from Bering Island, rather common ; collector's numbers, 2779 and 1496, 

 Mus. Cat. 40922; also among the dead shells from the beaches of Bering 

 Island. 



Piliscus commodus Lovfe>f ex Midd. 

 Filidium commodum Midd. 

 CapuJacmad ep., Sars. 



Bering Island. Collector's number, 2466. Mus. Cat. 40923. 



Crepidula grandis Middendorf. 

 Bering Island ; rare. Collector's number, 2467. Mus. Cat. 40924. 



Litoriuna sitkana Philippi. 

 Bering Island. Collector's numbers, 1791, 2464. Mus. Cat. 40925. 



Litorina sitkana var. suhtenehrosa Midd. 



Bering Island. Collector's numbers 2464 and 2779. Also Copper 

 Island. Collector's number 1007. Mus. Cat. 40926. 



Lacuna vincta Montague. 



Bering Island, rare. Collector's numbers 1496, very young, and 2779, 

 adult. Mus. Cat. 40927. 



Lacuna, subgenus Lacunella Dall. 



Shell depressed, heliciform, few-whorled, thin, with a strong epider- 

 mis ; margin of the aperture thin, with a narrow reflexed margin in the 

 adult, continuous with the thin, sharp, unreflected arcuate columella; 

 umbilicated. Operculum paucispiral. 



Lacunella refleza, n. s. (pi. II, figs. 1-3). 



Shell thin ; light to dark chestnut brown, smooth except for faint lines 

 of growth and wrinkles of the epidermis near the suture or in the um- 

 bilicus ; whorls two and a half to three, the last very much the laruest, 

 inflated ; suture distinct, the epidermis sometimes wrinkled close to it ; 

 nucleus polished ; aperture wide, oblique, rounded, the upper end of the 



