of the Pacific Shores of North America. 515 
tion, the stomach was found to be filled with Amphipoda, 
chiefly a species of Corophium. The specimens were not 
in a very good state of preservation, but enough remained 
to show that although agreeing with the preceding species 
in most characters, particularly in the spines of the an- 
tenne and the hairiness of the feet, they are yet specifically 
distinct. . The body is rather more elongated and depressed 
than in C. spinicorne ; the inferior antennse are much longer, 
and the superior ones smaller. The color is a reddish 
purple. 
Mus. Smithsonian. 
ERICHTHONIUS RAPAX. Stimpson, n. s. 
If the obsolescence of the first two pairs of epimera in 
Epw Anps? Erichthonius, shall prove a constant and not an 
accidental character, the species here described will properly 
be referred to Pyctilus, Dana. There are small epimera on 
the first thoracic segment, and larger ones on the second ; 
both narrow, not touching each other. Antenne sub-equal, 
one third as long as the body; superior ones with six- 
articulate flagella; inferior ones strongly toothed at the 
Inferior angle of their basal joint, and with ten-articulate 
lla. Mandibular palpi reaching beyond the middle 
of the basal joint of the superior antennæ. Eyes on lobes 
Which protrude forward between the bases of the antennæ. 
Hands of the first pair small, sub-cheliform ; those of the 
cond pair of great size, with a bi-articulate finger, and a 
thumb one third as long as the finger, with a strong tooth 
at the middle of its inner side. Color, brownish. Length, 
one fourth of an inch. 
It was dredged on a sandy bottom at the depth of two 
fathoms, in the Bay of San Francisco, near the city. 
P. Exp. 
