140 
GAMMARIDiE. 
AMP IIIP OB A. P 110X1 DES. 
NATATORIA. 
Specific character. Superior antennae scarcely reaching beyond the ex- 
tremity of the cephalon. Inferior antennae nearly three times as long as 
the superior. Three anterior coxae having four simple hairs near the hinder 
angle of the inferior margin. 
Length, ^ inch. 
Phoxus simplex. Spence Bate, Ann. Nat. Hist. 2 ser. 1857, vol. xx. p. 525. 
Cat. Amph. Brit. Mus. p. 97, pi. xvi. fig. 1. 
Phoxus Kroyeri. Spence Bate, Synopsis, &c. Ann. Nat. Hist. Feb. 1857, 
2 Ser. xix. p. 152. Brit. Assoc. Rep. 1855, p. 58 (not 
of Stimpson in Proc. N. Hist. Soc. Boston). White, 
Hist. Brit. Crust, p. 173. 
This species has the dorsal surface of the head con- 
siderably produced, and gradually narrowed, without 
being curved downwards, and with the apex obtusely 
rounded. The eyes have not been observed, owing pro- 
bably to the circumstance of the animal not having been 
examined until some time after death, whence we are led 
to suppose that they are imperfect in their structure. 
The superior antennae are very short, scarcely reaching 
beyond the extremity of the overhanging head ; the 
