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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
Arctic Ocean to Puget Sound, Washington.
Figure 88a
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
Arctic Ocean to Puget Sound, Washington.
Plate 30t; figure 88h
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 Meteromacovia Habe 1952
Gastrana irus Hanley Irus Macoma
Bering Sea to Los Angeles, California. Japan.
Figure 88e
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.