268 REPORT ON ALBATROSS MOLLUSCA DALL. 



indebted to Edgar A. Smith, esq., assistant, Britisli Museum, in charge 

 of the collection of Mollusca. It was found near one of the Japanese 

 islands, Qnelpaart, in the Kurile chain, in 48 fathoms, and externally is 

 smooth, white, lightly maculated with yellowish spots. 



Callocardia albida sp. nov. 



Shell small, inflated, white, with a very thin pale dehiscent epidermis ; 

 sculpture of rather coarse, somewhat irregular concentric lines and 

 grooves, in harmony with the incremental lines; beaks high, stout, in- 

 flated; shell almost exactly the shape of Cytherea albida; lunule short, 

 wide, marginated by a distinct groove; ligament short, wholly external ; 

 escutcheon none, or undefined by any ridge; anterior end rounded, 

 posterior eud slightly more pointed; interior white smooth, the muscu- 

 lar scars faint, the pallial line simple, indistinct ; teeth in the left valve 

 two; one representing the fused middle and anterior tooth is formed by 

 the ventral margin of the hinge-plate projecting laterally in a squarish 

 elongate lamina showing two short curves concave downward and meet- 

 ing each other at a slight ridge, at the termination of which is a small 

 indentation in the profile of the lamina ; the other tooth is close to the 

 dorsal side of the hinge-plate, wholly separated from the other lamina, 

 than which.it is lower and less curved; it lies directly under the liga- 

 ment; altitude of shell 8; longitude 9; diameter 7 mm . 



Hab. — U. S. Fish Commission Station 27G2, in 59 fathoms, mud, east 

 from Eio Janeiro ; bottom temperature 57° F. 



A single left valve was obtained. This species is quite near C. 

 Adamsi from Sierra Leone, but has fuller aud stouter beaks and a more 

 elongated and Cytherea like outline; the lunule is also smaller aud pro- 

 portionately broader; the teeth differ in small details, being stout and 

 curved, not flat and low as in the typical Veslcomya. 



Callocardia Smithii Dall. 



Plate x, Figs. 1, 2, 3. 



Callocardia ( Vesicomya) Smithii Dall, Bull. Mus. Coinp. Zool., xvm, p. 439, Jane, 1889. 

 Shell pale straw color or yellowish white, glistening, sculptured with 

 fine somewhat irregular, rounded concentric incremental ridges, hardly 

 elevated above the general surface; valves full, evenly rounded below 

 aud behind, with a few, inconstant, extremely faint, radiating impres- 

 sions behind the beaks which do not essentially modify the margin or 

 the sculpture; beaks rather anterior, full, not bulbous; a feeble im- 

 pressed line proceeding from them marks the boundary of the lunule; 

 above and below this are two other slight flexures not concentrated into 

 lines, of which the lower one coincides with an extremely faiut wave on 

 the margin ; interior white, polished ; muscular scars narrow, the pallial 

 line simple with an extremely faint flexure just before it joins the pos- 

 terior adductor scar; scar of the pedal muscle just above the anterior 



