714 PROCEEDINGS OF THE ACADEMY OF ( NoV. , 



Off Rio Janeiro, Brazil, in 59 fathoms, bottom temperature 

 57° F. U. S. Nat. Mus., No. 96,132. 



Venericardia (Cyclocardia) Gouldii n. sp. 



Shell thin, ovate, inequilateral, moderately inflated with about 

 23 low, broad, rounded ribs with much narrower shallow interspaces, 

 the antex'ior ribs slightly creuulated by fine transverse ridges, the 

 ribs behind the umbones nearly smooth, covered by a yellowish- 

 brown periostracum; lunule very small and impressed, escutcheon 

 linear; inner margin creuulated below, hinge plate delicate, nar- 

 row, without marked laterals. Height 13.5, length 16.5, diame- 

 ter 8 mm., the beaks somewhat eroded. 



This species may possibly be a variety of V. ventricosa, corre- 

 sponding in its relation to that species with V. novanglicB Morse, in 

 its relation to V. borealis. But the probabilities are against it. 

 The measurements of the two most related and geographically most 

 adjacent forms are as follows : 



V. ventricosa, height 17.5, length 19, diameter 15.5 mm. 



V. stearnsii, height 14.5, length 13.5, diameter 11 mm. 



Only one, a living specimen, of V. Gouldii was obtained at a 

 depth of 822 fathoms, off San Diego, Cal. U. S. Nat. Mus., No. 

 109,270. 



Venericardia (Cyclocardia) incisa n. sp. 



Shell small, polished, with a smooth lively olive-green perios- 

 tracum over 18 to 20 flat radial ribs separated by linear incised 

 sulci and crossed by similar concentric sulci, about as distant as 

 the ribs are wide, lunule almost obsolete, no escutcheon visible ; 

 beaks moderately high, somewhat anterior ; hinge delicate, internal 

 margins strongly crenate ; siphonal end of the valves usually over- 

 grown by a commensal minute hydroid; height 10, length 9.5, 

 diameter 5.3 mm. 



Numerous specimens were obtained at different localities. The 

 types were compared with the Carditas in most of the Museums of 

 Northern Europe and appeared distinct. Type from Unalashka 

 in 16 fathoms. U. S. Nat. Mus., No. 109,267. 



Venericardia (Cyclocardia) stearnsii Ball. 



Venericardia ventricosa Gould, Proc. U. S. Nat. Mus., XIII, p. 216, 

 1890, ex parte; and PI. XVI, figs. 5. 6. 



Puget Sound 



