154 
GAMMA RULE. 
AM PH IPOD A . 
NATATORIA. 
PHOXIDES. 
Genus — WESTWOODILLA. 
Westwoodilla. Spence Bate, Cat. Amph. Brit. M/us. p. 102. 
Westwoodea (pars). Spence Bate, Rep. Brit. Assoc. 1855, p. 58. 
Westwoodia. Synop. Amph. Ann. Nat. Hist. 2 ser. xix. p. 139, Feh, 
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 Phoocus , 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. 
