24 C. BOVALLIUS, SYSTEMATICAL LIST OF THE AMPHIPODA HYPERIIDEA. 
the top of the head. First pair of antenne fixed at the an- 
terior side of the head; with a multi-articulate flagellum (in 
the male); second pair fixed at the anterior side of the head, 
multi-articulate (in the male) or rudimentary (in the female). 
Mandibles without palp. Seventh pair of pereiopoda not trans- 
formed. Peduncles normal. 
Subfamily 1. DATRELLINZE. 
Diagn. Head almost round. All the pereiopoda are 
simple, walking legs. Epimerals marked but not articulated. 
Gem FP HAIRELLA, nn g. 
Diagn. First and second pairs of pereiopoda simple, with 
straight, short dactyli. Carpi off all the pereiopoda elongated. 
Peduncles of uropoda very broad with distant rami. Telson 
very short and broad. 
1. D,. californica, C. BovarLius, 1885. 
xOn some forgotten genera among the Amphipodous Crustacea. Bi- 
hang till K. Svenska Vet.-Akad. Handl. Bä. 10. N:o 14, p. 11. 
Hab. Off the coast of South California. 
2. D. latissima, n. sp. 
Diagn. Head not higher and longer than the first two 
coalesced pereional segments. Carpus of first pair of pereio- 
poda twice broader and longer than metacarpus. Fifth pair 
much longer than fourth. Peduncles of first pair of uropoda 
shorter than those of second pair. Rami of last pair are 
broadly ovate. 
Hab. South Atlantic. 
Subfamily 2. PHRONIMINE. 
Diagn. Head conical. Fifth pair of pereiopoda are trans- 
formed into a. strong prehensile organ. HEpimerals coalesced 
with the pereional segments. 
