208 
GAMMARIDiE. 
A MP BIPOD A . PHOXIDES, 
NAT ATOM A, 
Genus — PHiEDR A . 
Phcedra. Spence Bate, Quarterly Journal of Geol. Soc. 1858, p. 137. 
Cat. Amph. Brit. Mus. p. 119. 
Generic character. Cephalon produced anteriorly. Seg- 
ments of the pereion short, of the pleon long. Superior an- 
tennae shorter than the inferior, furnished with a secondary 
appendage. Posterior pair of pleopoda considerably elongated, 
biramous. Telson simple or notched. 
The head is anteriorly produced, but not to so great 
an extent as in some of the preceding genera. The 
segments of the body are remarkably short, whilst those 
of the anterior half of the tail are extremely long. 
The eyes of the type were not observed. The superior 
antennae are shorter than the inferior, and rather more 
robust ; they are furnished with a secondary appendage. 
The coxae of the legs are small. The last three pairs of 
caudal appendages are double-branched, the branches of 
each pair respectively being subequal, those of the last 
pair being considerably elongated. The central tail-piece 
is squamiform or notched. 
This genus is founded on imperfect specimens. 
