232 
GAMMARIDvE. 
AMP HIP OD A. PH OXIDES. 
NAT ATOM A. 
Specific character. Posterior segments of the pereion, and anterior ones 
of the pleon, dorsally elevated into carinal teeth. Antennas scarcely one- 
fourth the length of the animal. Gfnathopoda slender. Telson deeply cleft. 
Length \ inch. 
Acanthonotus (?) Owenii. Spence Bate, Rep. Brit. Assoc. 1855, 
p. 58. Ann. Nat. Hist. 2 ser. vol. xix. 
p. 141. 
Acanthonotus testudo. 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. Gtosse, 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. 
Acanthonotus Cranchii. White, Cat. Crust. Brit. Mus. p. 57, 
1847. 
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- 
