DEX AMINE SPINOSA. 



237 



AMP HIP OB A. 



NAT ATOM A. 



GAMMARIDES. 



DEXAMINE SPIXOSA. 



Specific character. Each of the four anterior segments of the pleon ele- 

 vated into a large posteriorly-directed tooth ; first joint of the peduncle of 

 the upper antennae with a blunt tooth. 



Length \ inch. 



Cancer (Gammarus) spinosus. Montagu, Linn. Trans, vol. xi. t. ii. fig. 1. 



Dexamine spinosa. 



Amphithoe Marionis. 



Acanthonotus? spinosus. 

 Amphitoe spinosa. 



Leach, Edin. Encyc. vii. p. 433. Zool. Misc. 



ii. p. 23. Linn. Trans, xi. p. 359. Enc. 



Brit. Suppl. i. 425. Samouelle, Ent. 



Comp. p. 102. Thompson, Nat. Hist. 



Ireland, iv. p. 395. Desharest, Consid. 



sur les Crust, p. 263, pi. xlv. fig. 6. 



White, Cat. Brit. Crust. (1849), p. 49. 



Hist. Brit. Crust, p. 178, pi. x. fig. 7. 



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



Ann. Nat. Hist. 2 ser. xix. p. 141, 1857. 



Cat. Amph. Brit.Mus. p. 130, pi. 24, fig. 1. 

 Milne-Edwards, Ann. des Sci. Nat. xx. 



p. 375. Hist, des Crust, t. iii. p. 40. Cuv. 



Regne Anim. Edit. Crochard, pi. 60, fig. 6. 

 Milne -Edwards, Hist, des Crust, iii. p. 25. 

 Gosse, Mar. Zool. p. 141, f. 266. 



The head has the anterior margin produced in the 

 centre into a little flat rostrum. The body of the ani- 



