216 MOLLITSCA OF BEHING ISLAND. 



Buccinum percrassum Dull. 



Cf. Kobelt, Mon. Buc, Mart, uml Chemn. nenestc Ausf;;. 

 Two specimens of this Ibrin, whose nearest relative is B. xmlare 

 (though at first sight it looks much more like B. cyaneum) were discov- 

 ered among some B. cyaneum, var. morcManum, collected by Stejneger, 

 too late to insert in my preceding paper on Bering Island mollusks. 

 The soft ])arts had not been observed before. The shell is thick, like 

 the Arctic form figured by Dr. Kobelt from photographs of my type, but 

 smaller and much darker colored. The operculum is dispro])ortion- 

 ately large for a Buccinum, nearly filling the aperture, and making a 

 striking contrast with that of B. morcManum, which is always minute 

 and much of the time absent entirely. " 



Pleurotoma beringi Aurivillius. 



P. beriniji Aurivillius, Vega Exp., 1. c, p. .354, t. 13, fig. 3, 188.5. 

 Bering Island, Vega Expedition, dredged in 75 fathoms, sand, one 

 specimen ; several others were obtained between that and St. Lawrence 

 Island in 55 fathoms, sand. This is a very interesting and characteristic 

 species somewhat resembling a dextral P. vinosa. 



Bela violacea Mighels aud Adam.s. 



Pleurotoma ?;to7oc<;a Migh. & Ad., Bost. Soc, Nat. Hist. Proc. I, p. 50, 1841. 

 Bost .Journ. Nat. Hist., IV, p. 51, pi. IV, fig. 21, 1842. Verrill, Conn. 

 Acad. Trans., V, 482, 1882. Not of Anrivillius, 1. c, p. 348, 1885. 



Bering Island, Grebnitski. 



Prof. Verrill regards this form as a variety of the previously described 

 Pleitrotoma bicarinata Couthouy (1839). It has many other synonyms, 

 but I cannot agree that it is nearly related to simplex Midd., arctica A. 

 Adams, gigas Verkruzen, etc., as supposed by Mr. Aurivillius. It may 

 be, however, that he is not acquainted with the geuumeAnolacea and so 

 has been misled by specimens incorrectly labelled. 



Saxicava rugosa Liuu6. 



S. pholadis Leclie, Vega Exp., I.e., Ill, p. 440, 1883. 

 Shores of Bering Island, Vega Expedition. 



Cuspidaria (Cardiomya) pectinata Cpr., var beringensis Leche. 

 Xed'ra hehrinrienm Leche, 1. c, p. 438, pi. 32, figs. 1, 2, 1883. 



Bering Island, dredged on a sandy bottom at the depth of 65 fathoms 

 by the Vega Expedition. Port Etches, 15 fathoms mud, and elsewhere 

 in Alaska in about the same latitude, Dall. 



Tapes staminea Conrad. 



Venernplti petttii Desbayes, Midd. and Locbe, L c, p. 440, 1883. 

 Tapes diversus Sowerby fide Dunker. 



Shore at Bering Island, Vega Expedition. 



Modiolaria laevigata Gray ? 



M. luris Beck, Lecbe, 1. c, p. 450, pi. 34, figs. 20,30, 188.3. 



Shore at Bering Island, Vega Exi)edition. 



