^°189i!^'] PROCEEDINGS OF THE NATIONAL MUSEUM. 189 



Trophon (Boreotrophon) disparilis, sp. nov. 



Shell small, white, thin, elongate, with five whorls, with numerous 



hardly raised transverse ridges or lamellae on the sutural side of the last 



whorl, while the anterior part of the same whorl is sculptured with four 



. spiral, hardly raised ridges, and the transverse sculpture fails or be- 



|i comes feebler; whorls rounded, suture deep, canal long, curved, aperture 



^ rounded, simple; length of shell 15, of aperture and canal 11, breadth 



j of shell 7 millimetres. U. S. steamer Albatross, station 3018, off coast 



near Gray's harbor, Washington, in 52 fathoms. 



Pmicturella (galeata Gld. var?) major Dall. 



Shell resembling galeata in general and especially in the interior, but 

 very much larger; radii alternately large and small from the beginning; 

 shell white; anterior slope rectilinear, posterior slope slightly arched 

 and a little longer; internal margin crenulate; animal with a well 

 marked verge, length of shell 57, breadth 42, height 27 millimetres. 

 U. S. Steamer Albatross^ station 3262, off coastof Akutan Island, Bering 

 Sea, in 43 fathoms. 



Solemya Johnsoni, sp. nov. 



II 



Shell resembling 8. macrodactyla, Mabille and Eochebrune, from 

 Orange Harbor, Tierra del Fuego, but larger, longer in proportion, the 

 shorter end more tapering and the opposite end more rounded. Length 

 of shell 115, height 48, diameter 18 millimetres. The cartilage pit is 

 30 millimetres, behind the shorter end and the greatest length of the 

 digitate epidermis beyond the edge of the shelly valve is 23 millimetres. 

 U. S. steamer Albatross, station 3010, off coast of Lower California, in 

 1,005 fathoms. 



Cryptodon bisectus Dall. 



Venus Msecta Conrad, Pal. Wilkes Expl. Exped., vol. x. App. 1, p. 724, pi. 17, figs. 

 10, 10a [Miocene of Astoria.] Thyatira? Msecta, Meek, S. I. checklist Mioc. Fos. 

 1864, Conchocele iisecta, Gabb Pal. Cal. ii, p. 99, 1869. 



Off Port Orchard, Puget Sound, by Prof. O. B. Johnson, of Seattle, 

 1 Washington, and at station 2855, in 69 fathoms, off south coast of 

 Aliaska Peninsula by U. S. Steamer Albatross. This is undoubtedly 

 I the giant of the genus, some specimens reaching 2 inches in length. 



Family CARDITIDiE. 



Calyptogena, gen. nov. 



Shell ovate, smooth, without radiating sculpture and covered by a con- 

 spicuous epidermis ; valves closing hermetically; nonbyssiferous ; the 

 pallial line simple, the basal margin flat and entire. Shell without a 

 lunule but with a long excavated escutcheon ; the ligament deep-seated 

 but practically external. Hinge, in the right valve with a _/\,-shaped 

 socket and a triangular cardinal tooth below it, behind which is a short, 

 feeble, narrow, lateral tooth ; in the left valve a y\,-shaped cardinal and 



I 



