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21:0120 Paphia (Protothaca) staminea spatiosa Dall. 
Puget Sound to Anaheim bay, Cal. 
Type locality: Coos bay, Oregon. 
21:0121 Psephidia brunnea Dall. Catalina I., Cal. 
Shell small, rounded triangular, moderately convex, brown, 
pale yellow with zigzag brown reticulation, or even pale yellow- 
ish with only traces of red or brown on the hingeline; surface 
apparently smooth, with a dull silky effect, which on magnifica- 
tion is seen to be due to minute concentric close-set threadlike 
sculpture; beaks prominent, prodissoconch minute but distinct; 
hinge normal, strong; inner margins entire, pallial sinus shallow, 
irregular; length 3.7, height 3, diameter 2mm. The shells are 
often crowded with nepionic young as in Sphaerium. Monterey, 
Cal., to San Hipolito Point, Baja Cal. 
21:0122 Macoma brota Dall. Bering Sea to Puget Sound. 
21:0123 Macoma brota liparia Dall. 
Macoma brota is a new name for Tellina edentula Broderip 
and Sby., 1829 (non Spengler, 1793); and in part T. lata Midd. 
1851 (non Gmelin, 1792). The variety occurs as far south as 
Puget Sound. 
21:0124 Macoma inquinata arnheimi Dall. 
Kodiak I., Alaska, to San Francisco, Cal., Pleistocene, San 
Pedro, Cal. 
21:0125 Macoma quadrana Dall. 
Boca de Quadra, Alaska, to Coronado Islands, Baja Cal. 
21:01276 Macoma truncaria Dall. Arctic coast. 
21:01277 Ervilia californica Dall. 
Shell small, ovate, white with a rosy flush, inequilateral, 
the posterior end shorter; the beaks inconspicuous, the ends 
rounded, the basal margin arcuate; sculpture of fine close-set 
regular, uniform concentric threads over the whole surface; 
hinge strong, pallial sinus small; length 7, height 4.5, diameter 
2mm. San Pedro and San Diego, Cal. 
21:0128 Mactrella clisia Dall. Manzanillo, Mexico. 
21:0129 Sphenia trunculus Dall. San Diego, Cal. 
Shell short, whitish with a dirty ash-colored periostracum, 
rude and more or less distorted, abruptly truncate, almost equil- 
ateral, the anterior portion swollen, the posterior part attenu- 
ated; length 7, height 4.3, diameter 4 mm. Among barnacles on 
the wharf piles South to Panama. 
21:0130 Sphenia pholadidea Dall. S. Barbara, Cal. 
Shell small, thin, white, with a blackish periostracum, which 
is conspicuously laminate on posterior dorsal area; very in- 
equilateral, anterior side shorter, beaks inconspicuous, 4 mm. 
behind anterior end; sculpture of rude incremental lines, pos- 
terior end abruptly truncate, hardly attenuated; pallial sinus 
rounded, not reaching the vertical of the beaks; hinge with a 
prominent toothlike projection in right valve before, in the left 
valve behind the resilifer; length 12, height 5.3, diameter 4 mm. 
Colected by Major Rich. 
