154 GAM MARBLE. 



A MPHIP ODA . P II OX IDES. 



NATATOR1A. 



Genus WESTWOODILLA. 



Westwoodilla. SPENCE BATE, Cat. Amph. Brit. Mus. p. 102. 



Westwoodea (pars). SPENCE BATE, Rep. Brit. Assoc. 1855, p. 58. 

 Westwoodia. Synop. 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 without a secondary appendage. 

 Mandibles appendiculated. First pair of gnathopoda subche- 

 late. Second pair not subchelate. 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 antennae are simple, the superior having no secon- 

 dary appendage. The mandibles are furnished with an 

 appendage. The first and second pairs of legs are sub- 

 equal ; the first pair are subchelate, 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 appendages 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 Brulle for a genus of Hymenoptera. 



