148 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Vesicomya stearnsii Dali, 1895. 
Plate 11, figs. 7, 8. 
Proc. U. S. N. M., 17:693; fig. 1A. 18:17. 
Shell closely resembling V. venusta Dali, but larger, less inflated, the 
anterior end higher, the base more rounded, and the posterior end more 
angular and proportionally longer. Internally the flexure in the pallial 
line below the posterior adductor scar is more marked, and the ligament 
and also the posterior tooth in the right valve are conspicuously shorter. 
V. stearnsii has the same pale straw-colored epidermis and feeble incre¬ 
mental sculpture as V. venusta, but the lunule is narrower and the line 
circumscribing it less impressed. Length, 25; height, 17; diameter, 11.5 
mm. (Dali.) Described as callocardia. 
Type in U. S. N. M. Type locality, off coast of Washington near 
Tillamook. 
Range. Washington to the Gulf of California. 
Vesicomya ovalis Dali, 1895. 
Proc. U. S. N. M., 18:18. 
Shell resembling V. lepta, but smaller, more oval, the posterior dorsal 
border more arched, the proportional inflation greater, the lunule wider, 
the ligament proportionally and actually longer, the epidermis more 
adherent and without projecting fringes or lamellae; internally the teeth 
are smaller and more feeble, and the pallial line recedes less at the 
posterior adductor scar. Length, 36; height, 26; diameter, 16 mm. (Dali.) 
Type in U. S. N. M., No. 106898. Type locality, U. S. Fish Commis¬ 
sion station 3360, Gulf of Panama, in 1672 fathoms. 
Range. Clarence Strait, Alaska, in 322 fathoms to Panama Bay, in 
1672 fathoms. 
Subgenus Archivesica Dali, 1908. 
Vesicomya gigas Dali, 1895. 
Proc. U. S. N. M., 18:18. Bull. Comp. Zool., 43; pi. 16, fig. 9. 
Shell large, rather thin, inflated, with a thin, wrinkled, olivaceous 
epidermis over an earthy, concentrically, irregularly striated surface; 
beaks low, inconspicuous; lunule and escutcheon somewhat impressed, but 
not limited by any distinct line; valves elongated, recalling the shape of 
Modiola capax Conrad, in a general way; the anterior side shorter and 
less high, the base impressed in the middle, more expanded in front and 
behind; dorsal margin rather evenly arched; both ends rounded; inter¬ 
nally dentition strong, like that of V. lepta, but more distinctly developed; 
ligament short (about 20 mm.) set in a groove; interior of valve some¬ 
what radially striate; posterior adductor scar somewhat larger, the pallial 
line set in below it, somewhat irregular but not forming a distinct angular 
