PELECYPODS 459 
Genus Tagelus 
T. gibbus. The extended range and shore station of this exceedingly 
abundant species will cause it to be among the first accessions to the 
cabinet of the collector south of Cape Cod. It burrows deep in sand 
and mud, leaving two small openings to the hole for the accommodation 
SS S=a55 
SS ENR 
Tagelus gibbus, showing extended animal. 
of its two excessively long siphons. As in Solen and Ensis, the foot is 
large and muscular, tongue-shaped, and capable of remarkable change 
of form and great freedom of movement. The long white siphons, sepa- 
rated from the base and each provided with orange-colored eyes (or, 
rather, a rudimentary sort of visual organs), are the most important 
‘feature. The apex of the hinge is not, as in Solen and Ensis, at the end 
of the shell, but is more conventionally placed near the middle; the 
cardinal teeth are very small, two upon each valve and interlocking ; 
a flat, oblong, callous process serves as a fossette. The dorsal and 
ventral margins are parallel, and 
gape at both ends; the shell is white, 
and is covered with a dense yellow- 
ish epidermis, which, passing the 
ventral margin, appears to become 
continuous nae the ee nee man- 
SUREATer tle-edge. ere is no other species 
ne ne north of Hatteras with which this 
could be confounded. The double entrance to the burrow, which may 
be discovored about low-tide mark, is unique. JT. gibbus is a good spe- 
cies to examine for the crystalline stylet in the digestive tract. 
FAMILY GLYCIMERIDE 
Genus Glycimeris 
G. generosa. A large shell of the Pacific coast, occurrimg most 
abundantly in Puget Sound waters, where it frequents muddy shallows. 
It is a remarkable pelecypod in respect to its siphons and the degree of 
mantle fusion. The appearance of the animal is that of a huge pair of 
