SMITH : SOME MOLLUSCA- FKOM BERING SEA. 207 



tenuissimis indistincte striati ; apertura magna, rotunclata, intus 

 pulcherrime iridescens ; peristoma tenue, margine columellari albo 

 incrassato reflexo, umbilicum quasi obtegente. Diam. maj. 8, 

 min. 6 mm. ; alt. 4*5 mm. 



Eeadily clistinguisliable by its style of coloration and imperforate 

 base. In form very like V. Beringensis. Although this shell is 

 imperforate in the adult state, it scarcely falls into Photinula, the 

 character of the umbilical callus in that genus being rather difPerent. 

 Young examples of the present species are narrowly umbilicated. 



5. ACM^A- SYBAEITICA (Dall). 



Collisella (?) sijharitica, Dall : Amer. Journ. Conch., vol. vi, p. 257, 

 pi. xvii, fig. 34; Pilsbry, Man. Conch., ser. i, vol. xiii, 

 p. 22, pi. ix, figs. 22-4 {Acmcea). 



Hob. — Prybiloff Is., Aleutian Is., Japan. 



A single specimen from Copper Island is apparently a variety of 

 this species. It lacks the radiating colour-markings. 



