76 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Type in U. S. N. M., No. 110467. Type locality, U. S. S. Albatross 
Station 4677, Bering Sea, in 52 fathoms. 
Range. Petrel Bank, Bering Sea. 
Modiolaria taylori Dali, 1897. 
Plate 28, figs. 9, 10. 
Bull. Nat. Hist. Soc. British Columbia, 2:5; pi. 1, figs. 17, 18. 
Shell small, rather solid, modioliform, with a greenish epidermis, and 
dark purple nacre shining through; inflated, with the middle area of the 
exterior of the valves impressed; beaks low, not quite terminal; surface 
smooth, except for lines of growth; the anterior area very small, with 
some obscure radial striae; the middle area smooth, its basal margin 
pouting a little; posterior area, covering more than half the shell, swollen; 
ligament obscure, almost internal; margins of the valves smooth, except 
for some small denticulations on a thickened area below the beaks, and a 
few beyond the distal end of the ligament. Length, 5.5; height, 5; 
diameter, 2.5 mm. (Dali.) 
Type in U. S. N. M.? Type locality, Victoria, Vancouver Island, 
British Columbia. 
Range. Known only from the type locality. 
Modiolaria substriata Gray, 1824. 
App. Parry’s Voy., p. 245. Voy. de la Recherche; pi. 17, fig. 3. 
Shell somewhat oval, rather oblique, highest about the middle, rounded 
before, base slightly curved, hinge margin straight and then curving 
obliquely downward; beaks near the anterior end, prominent, and rounded ; 
valves moderately convex; surface coarsely marked by lines of growth, 
and divided into three fan-shaped compartments, of which the foremost 
one is marked by about 8 small, rounded, rib-like ridges, the spaces 
between them being flat, the hinder one marked by numerous similar 
ridges, the central one being plain or with very minute radiating lines; the 
limits between the posterior and middle compartments are designated by 
an elevated ridge passing from the beaks, and here the basal margin of 
the posterior compartments projects abruptly beyond that of the middle 
one, so that the rounded point of the shell forms a projecting lobe. 
Epidermis olive green, with dark chestnut-colored shades, folding over 
the edge. Interior of a brilliant, silvery lustre; edge of the two extreme 
compartments crenulated, and very strongly so near the ligament; a few 
folds on the edge not corresponding to the external ridges, are found 
just in front of the ligament. Length, 1 inch; height, ls / 20 of an inch; 
breadth, % 0 of an inch. (Gould, Invert, of Mass.) 
