278 University of California Publications in Zoology — [Vou. 14 
dorsal line straight; ventral line near posterior end indented, the posterior ex- 
tremity being much projected and sharply rounded; fold prominent; ligamental 
area short, scooped out.’’ 
Length, 25 mm. 
Occurrence.—At station D 5791 (1). 
This species is represented by a single valve dredged outside the 
Golden Gate in 29 fathoms. It rarely oceurs north of Monterey, 
although Miss Bertha Challis informs the writer that it is found in 
Puget Sound. 
Range.—San Francisco to Lower California (Dall). 
Macoma inquinata (Deshayes) 
Plate 23, figures 2a, 2b, 3a, and 3b; plate 24, figures la and 1b; plate 48 
Tellina inquinata Deshayes (1854), p. 357; Carpenter (1863), p. 639; Wood 
and Raymond (1891), p. 55; Dall (1960b), p. 307; Arnold, R. (1903), 
p. 162, pl. 16, fig. 4. 
Description—Arnold (1903) deseribed this species as follows: 
“*Shell of medium size, suboval, convex, thin, equivalve; umbones subcen- 
tral; anterior end dilated, rather prominently so in front of umbo of right valve; 
posterior end evenly arcuate from umbo and acutely rounded at posterior end 
about half way between dorsal and ventral margins; ligament of medium 
length, not prominent; two small cardinal teeth in each valve; pallial sinus does 
not reach anterior muscle-impression in the left valve.’’ 
Length, 4 to 55 mm. 
Occurrence—At stations D 5700 (8), D5702* (5), D5705 (2), 
D 5708 (2, 1), D5711 (9), D5712* (16), D5713 (13), D 5738 (2), 
D 5742 oF D 5749 (7), D5752 (11, 2), D5755 (2), D5763 (3), 
D 5773 (4, 7), D5778 (5), D5779 (11), 1D 5784 (1), D5795 (16), 
D 5796 At D 5798 (2), D5799 (2), D 5800 (15), D 5808 (1), D 5810 
(1), D 5824 B (19), D 5825 (7), D 5725 A (7), D 5825 B (10), D 5825 
(10), D5826 A (4), D5826 B (3), D5827 (48), D5827 A (49), 
D 5827 B (2), D 5828 B (3), D 5829 A (22), D 5832 A (3), D 5835 
(7), D 5834 (7), D5841 (3), D 5848 (4), Richmond (1), Sausalito 
(2), and questionably from D 5714, D 5731, D 5737, D 5766, D 5783, 
D 5846, D 5848, Red Rock. 
This common species is questionably represented in the Survey 
collections from the open ocean and abundantly represented from the 
bay. It was dredged most frequently within the middle division of 
the bay from a variety of types of bottoms. 
Range—Bering Strait to Monterey, California (Dall). 
