12 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
short; valves inflated, with seven anterior and twelve posterior hinge 
teeth, the resilifer narrow, elongated, very oblique, almost parallel with 
the posterior dorsal margin, hardly projecting inner margin of the valves 
entire; beaks prominent showing the prodissoconch, lunule obscure. 
Length, 8; height, 6; diameter, 3.5 mm. (Dali.) 
Type in U. S. N. M. No. 208727. Type locality Chugachik Bay, 
Cooks Inlet, Alaska, in 60 fathoms. 
Range. Chugachik Bay, Cooks Inlet, Alaska. 
Nucula petriola Dali, 1916. 
Proc. U. S. N. M., 52:395. 
Shell minute, ovate, inflated, the form resembling Crenalla Columbiana, 
the prodissoconch visible on the rather inflated beaks; lunule obscure; 
color greenish olive, smooth and polished; valve margins smooth, hinge 
line very short. Length, 125 ; height, 2 ; diameter, 1.5 mm. (Dali.) 
Type in U. S. N. M. No. 271416. Type locality, off Santa Rosa 
Island, California, in 53 fathoms, mud. 
Range. Known only from type locality. 
Nucula linki Dali, 1916. 
Proc. U. S. N. M., 52:394. 
Shell small, inflated, smooth, dark olive, very inequilateral, subtriangu- 
lar, the anterior end shorter; lunule large, bounded by a faint keel; beaks 
prominent showing the whitish prodissoconch; six anterior and eleven 
posterior hinge teeth; valve-margin entire; the resilifer small, deeply set, 
subumbonal, not projecting. Length, 6; height, 5; diameter, 3.6 mm. 
Type is in U. S. N. M. No. 107649. Type locality, Station 3034, 24 
fathoms mud; off Point Fermin, Lower California. 
Range. Queen Charlotte Sound to Guaymas, Mexico. 
Nucula cardara Dali, 1916. 
Proc. U. S. N. M., 52:394. 
Shell polished, light olive green, thin, elongate-oval, with eight anterior 
and eighteen posterior prominent teeth, the resilifer prominent and largely 
free from the hinge line, the interior very pearly, the valve-margin smooth, 
the beaks hardly prominent, situated 5 mm. behind the anterior end of 
the shell and showing the whitish prodissoconch. Length, 16; height, 11.5 ; 
diameter, 8 mm. (Dali.) 
Type in the U. S. N. M., No. 265905. Type locality, station 5673, off 
San Diego, California, in 1090 fathoms, mud. 
Range. Monterey, California, to Lower California. 
