524, APPENDIX. 
AMPHIPODA. HAYPERIIDA. 
HYPERINA. (Vol. IL. p. 19.*) 

Genus—VIBILIA. 
Vibilia. Epwarps, Ann. des Sci. Nat. t. xx. p. 386. Hist. des Crust. 
t. iii. p. 72. Spence Bats, Cat. Amph. B. M. p. 299. 
Lanceola? Say, Proc. Acad. Phil. p. 317. 
Generic character. Cephalon small. Pereion smooth, not dis- 
tended. First two segments of the pereion short, the rest gradually 
increasing in length. Segments of the pleon a little deeper than 
those of the pereion. Eyes small. Antenne short; superior pair 
terminating in a vertically compressed uniarticulate flagellum. 
First pair of gnathopoda small, slender, cylindrical, having the infe- 
rior angle of the carpus but little, if at all, produced; second pair 
having the inferior angle of the meros and carpus considerably pro- 
duced anteriorly. First two pairs of pereiopoda subequally long. 
Third and fourth pairs longer than the preceding, subequal. Last 
pair very short. Three posterior pairs of pleopoda, with the 
peduncle long and the rami short and compressed. Telson single. 

VIBILIA BOREALIS, N.S. 
Specific character. Cephalon not anteriorly produced. Pereion with the 
segments gradually enlarged. Flagellum of upper antennz flat, with two 
rows of cilia on the internal surface. Last pair of pereiopoda minute. 
Length, seven-twentieths of an inch. 
