232 



GAMMARIDiE. 



AMP BIPOD A, 



NAT ATOM A. 



PH OXIDES. 



ACANTHONOTUS OWENII. 



Specific character. Postei-ior segments of the pereion, and anterior ones 

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

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



Length \ inch. 



S pence Bate, Rep. Brit. Assoc. 1855, 

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

 p. 141. 



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

 Pop. Hist. Brit. Crust, p. 177. S pence 

 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.) 

 Vertumnus Cranchii, Leach MSS. White, List Crust. Brit. Mus. p. 89, 



1847. 



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

 1847. 



Acanthonotus (?) Oivenii. 



Acanthonotus testudo. 



A canthonotus Cranchii. 



The head is anteriorly produced to a point, deflexed 

 between the antennae. 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- 



