362 



GAMMA RIM. 



Gammarus carinatus. 



Amathla carinata. 



Johnston, Zool. Journ. iv. 52 (not of Fabricius, 

 Ent. Syst. ii. 515, which = Atylus carinatus, 

 Leach). 



White, Hist. Brit. Crust, p. 182. Spence 



Bate, Rep. Brit. Assoc. 1855, p. 58. Ann. 



Nat. Hist. 2 ser. xix. p. 143. Bruzelius, 



Skan. Amph. Gamin, p. 50 (not Ratbke). 



Dexamine? carino-spinosa. White, Cat. Crust. Brit. Mus. 1847. Cat. 



Brit. Mus. 1850. Hist. Brit. Crust, p. 178 

 (but not of Turton, Syst. Nat. iii. p. 760, 

 which is Atylns carinatus). 



Gosse, Mar. Zool. i. p. 141. 



Spence Bate, Cat. Amph. Brit. Mus. p. 199, 

 pi. xxxv. fig. 11. 



Spence Bate, Ann. Nat. Hist. 2 ser. vii. p. 318, 

 pi. x. fig. 10, 1855. G-osse, Mar. Zool. i. p. 

 141. 



Rathke, Nov. Act. Acad. Leop. xx. p. 72, t. iii. 

 fig. 3. Liljeborg, Ofvers. af Kongl. Yet. 

 Akad. Forhandl. 1851, p. 23, No. 02 ; 1853, 

 p. 447 ; 1855, p. 124, No. 15. Bruzelius, 

 Skand. Amph. Gamm. p. 50. Frey u. Leuck- 

 ardt, Beit. z. Kenntn. wirbellos. Thiere, 

 p. 162 (in Bruzelius, 1. c). 



A mphithoe carino-spinosa. 

 A mathia carino-spinosa. 



A mphithoe Moggridgei. 



Gammarus angulosus. 



The head is anteriorly produced to a small rostrum. 

 A carina traverses the median line of the back, increasing 

 in height to the penultimate segments of the tail j the 

 three posterior segments of the body, and the first two 

 of the tail, being produced posteriorly into a sharp 

 tooth. There is also a slight carina separating the 

 dorsal from the lateral regions of the animal in the last- 

 mentioned segments. The fourth and fifth segments of 

 the tail have the carina posteriorly terminating in an 

 obtuse edge, the dorsal margin of each being slightly de- 

 pressed at the centre ; the surface of the skin being rather 

 rough, with a row of minute granules on the posterior 

 margin of each segment. The eyes are reniform. The su- 

 perior antennae are scarcely half the length of the animal. 

 The flagellum is as long as the peduncle, having the 



