154 GAMMAllID^. 



AMPHIPODA. PIIOXIDES. 



NAVATORIA. 



Genus— WESTWOODILLA. 



Westivoodilla. Spence Bate, Cat. Amph. Brit. Mus. p. 102. 



Westivoodea (pars). Spence Bate, Rep. Brit. Assoc, 1855, p. 58. 

 Wesfivoodia. Sjnop. Amph. Ann. Nat. Hist. 2 ser. xix. p. 139, Feb. 



1857. White, Hist. Brit. Crust, p. 172. 



Generic character. Cephalon anteriorly produced. Eyes con- 

 fluent. Superior antennae witliout a secondary appendage. 

 Mandibles appendiculated. First pair of gnathopoda subche- 

 late. Second pair' not subclielate. Posterior pair of pereio- 

 poda longest. Posterior pair of pleopoda biramous. Telson 

 squamiform. 



The head is produced anteriorly as in Phoxus, but 

 more depressed. The eyes are associated, so that they 

 appear as a single organ, imbedded within the head. 

 The antennas are simple, the superior having no secon- 

 dary appendage. The mandibles are furnished with an 

 appendage. The first and second paii's of legs are sub- 

 equal ; the first pair are svibchelate, — the second are not 

 so, but terminate in a finger, which does not fall back 

 against the hand. The walking feet gradually increase 

 in length, but the last is considerably longer than the 

 rest. The posterior pair of caudal ajipendages are bi- 

 ramous, and the terminal plate is squamous. 



This genus resembles Monoculodes of Stimpson, but 

 differs from it in having the hands less perfect in their 

 prehensile character. The name Westwoodea proposed in 

 the ''Report on the British Edriophthalma" required to 

 be changed, in consequence of its having been previously 

 adopted by Dana for a genus of Entomostracous Crus- 

 tacea, and by BruUe for a genus of Hymenoptera. 



