416 
COROPHIULE. 
AMP HIP OB A. P ODOCERIBES. 
NATATORIA. 
Genus— AMPHITHOE. 
Amphithoe. Leach, Edin. Encyc. vii. p. 402. Linn. Trans, xi. p. 361. 
Spence Bate, Ann. Nat. Hist. 2 ser. vol. xix. p. 147. Cat. 
Amph. Biit. Mus. p. 233. White, Hist. Brit. Crust, 
p. 200. Dana, U.S. Explor. Exped. p. 935. {part). 
Edwards Hist, des Crust, t. iii. p. 28. Desmarest, 
Consid. sur Crust, p. 268. 
Anisopus. Templeton, Trans. Ent. Soc. Ser. i. v. i. p. 188. 
Cymadusa. Savignt, Egypte. Crust, pi. 26. 
Pleonexes. Spence Bate, Ann. Nat. Hist. 2 ser. xix. p. 147. 
Generic character. Coxa of the third pair of pereiopoda 
having the anterior lobe as deep as the coxa of the second, 
and the posterior lobe very small. Second pair of gnathopoda 
larger than the first. Posterior pair of pleopoda biramous ; 
outer ramus, terminating in one or more short slightly curved 
spines ; the inner one in a subfoliaceous lamina. Telson single 
squamiform. 
This genus may at once be identified by the deep 
coxa of the fifth pair of legs, the form of the superior 
antennae, and the caudal appendages. 
The eyes are situated on a lobe between the superior 
and inferior antennae. The antennae are subequal ; the 
inferior terminating in a multi-articulate flagellum. The 
second pair of legs have the hands rather larger than those 
of the first. The coxa of the fifth pair of legs has the 
anterior lobe as large and as deep as the coxa of the 
preceding pair of legs, while the posterior lobe is very 
small, the thigh, as usual, articulating between them. 
The posterior pair of caudal appendages have the 
branches very short, the inner one being subfoliaceous, 
and the outer furnished with spines curved like hooks. 
The central caudal plate is single, and terminates in a 
rounded apex. 
