OTHER BIVALVE. “MOELUSKS 91 
Fig. 81x 4 
measure seven and a half inches in length. The 
creature burrows to a depth of two feet or more. 
The valves are oblong, rather flat, and are marked 
with decided lines of growth. They gape widely 
where the siphons enter. The left valve has a 
hinge-tooth like a sharp horn. The shells are dull 
white without, but pearly and shining within. In 
the north this great creature is sometimes known 
by the singular name of ‘‘Goeduck.’’ 
Panomya ampla, Dall, the Ample Panomya, is 
an Alaskan shell, coarse, chalky white, with a 
black, tarry epidermis which falls off. The shell 
is nearly square, and is some three inches across. 
It gapes, and does not fully cover the living ani- 
mal. 
