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- 

 tennae 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 antennae are much longer, 

 and the superior ones smaller. The color is a reddish 

 purple. 



Mas. Smithsonian. 



ERICHTHOSIUS RAP AX. Stimpson, n. s. 



If the obsolescence of the first two pairs of epimera in 

 Edwards' 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. Antennae 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 

 flagella. Mandibular palpi reaching beyond the middle 

 of the basal joint of the superior antennae. Eyes on lobes 

 which protrude forward between the bases of the antennae. 

 Hands of the first pair small, sub-cheliform ; those of the 

 second 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. 



Mus. N. P. Exp. 



