1902.] NATURAL SCIENCES OF PHILADELPHIA. 709 



Venericardia (Cyclocardia) ventricosa Gould, 1850. 



Puget Sound, U. S. Exploring Expedition ; Vancouver Island 

 (Newcombe), and southward to Los Coronados Islands off Lower 

 California, living in 31 to 252 fathoms, soft bottom, temperature 

 43 2° to 58° F. 



A small, plump, rounded species, with 20-21 low, broad, radial 

 ribs, with shallow narrower interspaces, crossed by flattish narrow 

 concentric ridges, recalling basket-work, and covered by a gray or 

 yellowish-brown velvety periostracum, the hairs of which are 

 disposed in radial lines. Gould's types comprised two species, of 

 which one which he figured is selected to carry his name. The other, 

 represented by a single specimen, was unfortunately figured as his 

 type in Proc. U. S. Nat. Mus., XIII, Plate XVI, figs. 5 and 

 6 in 1890.' It was not until this revision was undertaken that the 

 discrepancy was observed. Gould's diagnosis refers partly to each 

 species. 

 Venericardia (ventricosa var.?) Gouldii Dall. 



Station 2,923, in 822 fathoms, mud, off San Diego, Cal., bottom 

 temperature 39° F. ; U. S. Fish Commission steamer " Albatross." 

 Shell ovate, subcompressed, with 23 ribs, sculpture similar to 

 that of V. ventricosa but feebler, with concentric ridges only in 

 front of the low beaks, and the color paler, the lunule much 

 smaller, and the lunular cardinals thin and feeble. The animal 

 was alive when dredged and appears, from the dried remains, to 

 have had a much smaller foot than V. ventricosa. 

 Venericardia (Cyclocardia) stearnsii DaU, 1902. 



Puget Sound, with V. ventricosa, U. S. Exploring Expedition 

 under Wilkes. 



SheU short, plump, strong, with very high prosogyrate beaks 

 and about 19 strong, rudely nodulous radial ribs with narrower 

 interspaces and a dark-brown pilose periostracum. It has been 

 figured as mentioned under V. ventricosa, having been erroneously 

 taken as the type of that species by the writer. It is a much 

 shorter and higher shell with a very small deeply impressed lunule 

 and strong hinge, in which the lunular pustule in the left valve is 

 conspicuous. 



Venericardia (Cyclocardia) monilicosta Gabb, 1861. 

 Pleistocene of Santa Barbara, Cal., Jewett. 

 This resembles V. ventricosa Gould, but is more compressed, very 



