Ae San Diégo, Cal., 922 fathiowa.. 
‘ically scuiptured, with a few micro- 
~ shorter, anterior end rounded, . 
es Shi x 
r bluntly pointe: : 
nule and escutcheon present; beaks conspicuous, the pro- 
onch vistble, whitish; | ‘about 10 anterior and 14 posterior 
a: “wholly posterior. Leet 4, height. 2.7, 
er 2mm e | 
20 75 Glycymeris Gumebage Dall. Bored Bank, Cal. 
_ Shell solid, white with a’ brownish periostracum, the surface 
ely concentrically sculptured, with less conspicuous fine radiat- 
strise, on which the periostracum exhibits ciliated lines; 
ilves moderately * ‘compressed, suborbicular, evenly rounded in 
enulated;. beaks small, inconspicuous; area very narrow, closely 
ricately grooved; hinge plate broad, with about 12 anterior 
16 posterior teeth. Length 22, height 20, diameter 11 mm. 
ester Island, Alaska. eas A ee 
0007 6 Glycymeris migueliana Dall. San Miguel Island, Cal. 
4 Shell solid, white with sparse zigzag lines of reddish brown 
n;> surface amoath except for irregularities of growth; valves 
iborbicular, anterior side slightly longer, posterior hardly pro- 
uced; beaks low, area small and divaricately grooved; .inner 
sal margin .crenulated; anterior teeth 10-14, posterior 9-12; 
wives moderately convex. Length 23, height 22, diameter 14 
i. Cape Bianco, Oregon, to Magdalena bay, Baja Cal. 
1:00' 077 Limorsis skenia Dall. Bering Sea. 
[:0078 Limopsis akutanica Dall. Akutan Island. 
0079 Ptevia viridizona Dall.’ Long Beach, Cal. 
row darker and. lighter zones, sculptured with narrow, very elon- 
ate, ‘opaque, whitish ‘seales, distributed in radiating lines: with 
ider bare spaces between them; right valve smaller and flatter 
ith a sinus for byssus; left valve larger with the anterior ear 
“ npressed but not sinuate; hinge -line shorter than shell with a 
allow rounded sinus between posterior ear and body of disk; 
Beeld terior With the pearly area small and no denticulations on hinge 
line.’ Length 25, height-43, diameter 5 mm: Collected by H. N. 
-0080 VulselHa pacifica Dall. Nicaragua. 
11:0081 Pecten (Pseudaniusium) ineongruum Dall. 
» Shell small, white, suborbicular, left valve rather flat with 
hort straight hinge line, ears concentrically scaly, sculpture of 
isk concentric continuous low sharp lamellae, crossed by slightly 
3 sed radial lines, conspicuous only at the intersections which 
- form in the middle of the disk square reticulations with’a small 
thin, “funtlanguler of a uniform olive color, _ 
mspicuously arcuate, dorsal slopes 
D extremely narrow and small ianeey a 
ont and below, somewhat produced behind, lower margins finely © 
Shell small, oval, translucent, sea-green,’ distrin uted: in nar- 
oe pustule at each intersection; mayne these are more’ 
