232 



GAMMARID^. 



AMPIIIPODA. 



NATATORIJ. 



PHOXIDES. 



ACANTHONOTUS OWENII. 



Specific character. Posterior segments of the pereion, and anterior ones 

 of the pleon, dorsally elevated into carinal teeth. Antennfe scarcely one- 

 fourth the length of the animal. Gnathopoda slender. Telson deeply cleft. 



Lenffth A inch. 



Acanthonotus (?) Owenii. 



Acanthonotus testudo. 



Vertumnus CvancMi, Leach MSS. 



A canthonotiis Cranchii. 



Spence Bate, Rep. Brit. Assoc. 1855, 

 p. 58. Ann. Nat. Hist. 2 ser. vol. six. 

 p. 141. 



White, Cat. Brit. Crust, p. 51 (1850). 

 Pop. Hist. Brit. Crust, p. 1 7 7. Spence 

 Bate, Cat. Amph. Crust. Brit. Mus. 

 p. 127, pi. xxiii. fig. 3. Gosse, Man. 

 Mar. Zool. p. 42 (1855) (not Oniscus 

 testudo, Mont, see ante, p. 228.) 



White, List Crust. Brit. Mus. p. 89, 

 1847. 



White, Cat. Crust. Brit. Mus. p. 57, 

 1847. 



The head is anteriorly produced to a point, deflexed 

 between the antennge. The last segments of the body, 

 and the four anterior of the tail, are elevated into a ca- 

 rina ; the middle of the posterior margin of each segment 

 is produced into a strong tooth ; the three anterior seg- 



