84 WEST AMERICAN SHELES 
Macoma inquinata, Desh., the Polluted Macoma, 
is a variable species, resembling a degraded M. 
nasuta. In this species, however, the pallial sinus 
does not touch the forward muscle-sear in either 
valve. The shell is white, and measures about an 
ineh and a half in length. 
Macoma balthica, Linn., var. in- 
conspicua, Brod. & Sby., the Little 
Macoma, (M. inconspicua). The 
shell of this species 1s well shown in : 
Figure 75. The little shell is thin, Higa/® 
flat, and either white or pink. The figure repre- 
sents a good-sized specimen, though it grows still 
larger. 
Macoma inflatula, Dall, the Inflated Macoma, re- 
sembles a young M. nasuta, but is thin, rather in- 
flated, strongly bent, has a pointed posterior and a 
greenish epidermis. It is a northern species, but is 
found in deep water farther to the south. 
Fig. 76, x # (*) 
oO 
Macoma sitkana, Dall, the Sitka Macoma, is 
shown in Figure 76. The shell is thin and white, 
while the other features are well shown in the en- 
eravings. As its name indicates, its home is in 
Alaska, reaching northward from Sitka. 
Macoma sécta, the Giant Macoma, is shown in 
Figure 77. It is the largest and finest species of 
