TELLINIDAE 43 3 



Macoma yoldijormis Carpenter Yoldia-shaped Macoma 



Alaska to San Diego, California. 



% to %. inch in length, elongate, moderately rounded at each end and 

 with a small, but distinct, twist to the right at the posterior end. Color a 

 uniform, glossy, porcellaneous white. Rarely translucent with an opalescent 

 sheen. Common from shore to 25 fathoms. 



Macoma carlottensis Whiteaves Queen Charlotte Macoma 



Arctic Ocean to Lower California. 



About I inch in length, extremely fragile, inflated and with a very short, 

 inconspicuous ligament. Color translucent-white with a thin, greenish, glossy 

 periostracum. This species was named inflatula Dall at a later date. 



Macoma brota Dall Brota Macoma 



Figure 88a 



Arctic Ocean to Puget Sound, Washington. 



3 inches in length, moderately elongate, moderately inflated and rather 

 thick-shelled. Beaks % toward the posterior end. Resembles calcarea whose 

 pallial sinus in the left valve, however, is more elongate, not as high and 

 generally reaches nearer the anterior muscle scar. M. brota is larger and 

 more truncate posteriorly than that species. Common. 



Macoma planhisciila Grant and Gale Grant and Gale Macoma 



Plate 30t; figure 88h 



Arctic Ocean to Puget Sound, Washington. 



About I inch in length. Extremely similar to calcarea, but porcellaneous, 

 with a glossy, yellowish periostracum and more oval in shape. This species 

 was thought by Dall and others to be ''''carlottejisis Whiteaves." 



Genus Gastrana Schumacher 1817 

 Subgenus Meter omacovia Habe 1952 



Gastrana irus Hanley Irus Macoma 



Figure 88e 



Bering Sea to Los Angeles, California. Japan. 



Commonly 1% inches in length (rarely 3); oval-elongate, moderately 

 inflated, very sHghtly twisted, if at all, at the posterior end. Pallial sinus in 

 left valve almost reaches the bottom of the anterior muscle scar. Beaks 

 slightly anterior. Common in Washington and Oregon. Formerly known 

 as inqiiinata Deshayes. 



