338 GAMMARIM. 



Brit. Edrioph. Crust. Ann. Nat. Hist. 

 2 ser. xix. p. 144. Cat. Am ph. Crust. 

 Brit. Mus. p. 182, pi. xxxiii. fig. 2. 

 White, Pop. Hist. Brit. Crust, p. 184. 

 Bruzelius, Skand. Amph. Gamm. p. 56. 

 Gammarus incequimanus. Spence Bate, Ann. Nat. Hist. 2 ser. xix. 



p. 145. White, Pop. Hist. Brit. Crust, 

 p. 185. 



The fourth segment of the tail is posteriorly armed 

 with a small central tooth, and the fifth with two very 

 minute ones. The eyes are almost round. The superior 

 antennae are rather more than half the length of the 

 animal, terminating in a flagellum not so long as the 

 peduncle, and furnished with a short triarticular second- 

 ary appendage. The inferior antennae have the peduncle 

 as long as that of the superior, but the flagellum is much 

 shorter than the flagellum of the superior. The first 

 pair of legs have the hands but slightly dilated, whilst 

 those of the second are very large. In the second pair 

 the palm is convexly produced at the extremity to an 

 extent equal to the length of the finger, and rounded off 

 obtusely at the inferior angle, with which it lies at a right 

 angle ; the inferior margin is straight and furnished 

 with fasciculi of hairs, while the upper is arcuate and 

 clean ; the inner side of the hand is concave : and the 

 short curved and pointed finger impinges against the 

 middle of the joint (as shown in the vignette) instead of 

 against the palm or anterior margin as is usually the case ; 

 the outer surface of the hand is convex ; and when the 

 organs are at rest they act the part of a boxlike shield 

 for the protection of the oral and anterior appendages. 

 The three posterior pairs of legs are strong and fringed 

 with hairs ; the thighs being slightly serrated upon the 

 posterior margins. The ante and penultimate pairs of 

 caudal appendages are short, especially the latter, whilst 

 the ultimate (which were broken off in the specimen 



