CLASS PELECYPODA 
171 
sloping, end subtruncated, sinuous; anterior side somewhat inflated, rather 
longer, dorsal margin, obliquely convex, umbones sloping backward, 
ligament partly imbedded, hinge margin with small central and no lateral 
teeth. (Conch. Iconica.) 
This is Tellina edentula Broderip and Sowerby. 
Type in U. S. N. M. Type locality, Bering Strait. 
Range. Arctic Ocean, Bering Sea to Puget Sound. 
Macoma brota lipara Dali, 1916. 
Plate 42, fig. 6. 
Proc. U. S. N. M., 52:414. 
Shell resembling brota but more rotund, less rostrate, with a wider and 
rounder anterior end, shorter and more rounded posterior end, and more 
polished surface. Length, 74; height, 57; diameter, 25. (Dali.) 
Type in U. S. N. M. No. 223032. Type locality, same as the typical. 
Range. South of Bering Strait to Puget Sound. 
Macoma sitkana Dali, 1900. 
Proc. U. S. N. M., 23:323; pi. 4, figs. 6, 7. 
Shell thin, calcareous, elongate, nearly equilateral, white, with a dull 
papyraceous, grayish-olive periostracum; surface marked only by lines of 
growth, which are stronger posteriorly; anterior end larger and pretty 
evenly rounded, posterior end attenuated, rather squarely truncate, flexu- 
ous, and moderately gaping; hinge delicate, normal; pallial sinus discrepant 
in the two valves, in the right valve shorter and higher and about half 
confluent below, in the left longer, nearly reaching the adductor scars and 
almost entirely confluent with the pallial line below. Length, 41; height, 
26; diameter, 10 mm. (Dali.) 
Type in U. S. N. M., No. 108656. Type locality, Sitka Harbor, Alaska. 
Range. Kodiak Island to Lituga and Sitka, Alaska. 
Macoma kelseyi Dali, 1900. 
Trans. Wagner Inst., 3:1052; pi. 9, fig. 7. 
Shell large, solid, heavy, compressed, slightly flexed; beaks subcentral, 
prominent, pointed; anterior end evenly rounded into an arcuate base and 
dorsal margin; posterior end lanceolate, the dorsal margin nearly rectili¬ 
near; surface sculptured only by strong, rather irregular lines of growth; 
hinge plate short, broad, and strong; teeth normal, elongated, large; pallial 
sinus discrepant in the two valves; left valve with the upper part of the 
sinus sinuous, extending from the posterior to the anterior adductor, 
behind which is a thickened obscure ray; right valve with the sinus short, 
gibbous, the anterior end rounded, thence the line curves backward before 
coalescing with the pallial line below; in the left valve the sinus is coinci- 
