416 COROPHIIDJC. 



AMPHIPODA. PODOCERIDES. 



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. Brit. 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. SAVIGNF, 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. 



