86 THE NAUTILUS. 



A number of valves collected near the head of the Gulf of Cala. 

 by Dr. E. Palmer some years ago. 



Pecten Randolph! Dall, n. sp. 



Shell small, thin, glassy, unsculptured, except by minute "camp- 

 tonectes " striation which covers both valves, and more or less ob- 

 scure concentric undulations which are most distinct on the right 

 valve near the umbo, and in some specimens altogether absent; 

 hinge straight and short, anterior ears distinct, posterior ears not 

 defined by any fold or sinus, outline suborbicular, valves com- 

 pressed, especially the right one; right anterior ear with six small 

 imbricated radii above, below a wide, transversely striated fasciole 

 derived from a well marked byssal sinus ; ctenolium with four or five 

 functional spines. Alt. 27'5, lat. 26, diam. 5 mm. 



Off Destruction Island, State of Washington, in 516 fathoms, 

 bottom temperature, 38 Fahr., U. S. Fish Commission. 



This species was obtained at a number of stations, from Bering 

 Sea to West Mexico, in 225 to 1005 fathoms. It is named in honor 

 of Mr. P. B. Randolph, of Seattle, who has done excellent work on 

 the Puget Sound fauna. 



Pecten Davidson! Ball, n. sp. 



Shell small, suborbicular, compressed, waxen white, the left valve 

 with 21 rounded ribs, surmounted by (when not worn off) continu- 

 ous rows of minute subglobular scales, the interspaces wider, flat and 

 perfectly smooth, ears very small, the anterior with five or six im- 

 bricated radii; sculpture obsolete near the umbones ; right valve 

 sculptured with faint concentric impressed lines over the whole sur- 

 face, and distally with numerous minute, obsolete, fine, scaly riblets; 

 posterior ear transversely striated, very small, anterior one with four 

 or five scaly radii, a well marked sinus leaving an imbricated fas- 

 ciole and no ctenolium. Interior polished, the left valve fluted 

 internally in harmony with the external ribs. Alt. 14, lat. 14, 

 diam. 3'5 mm. 



On the Davidson Bank, Alaska, in 280 fathoms, green mud, and 

 north of Unalashka, in Bering Sea, in 351 fathoms, sand ; U. S. 

 Fish Commission. 



This little shell resembles somewhat P. (Propeamusiuni) alasken- 

 sis Dall, externally, but wants the radiating lirse internally, is 

 smaller, and has faint radiating sculpture on the right valve, which 

 is wanting in P. alaskensis. 



