ANONYX DENTICULATUS. 
101 
AMP IIIP OB A. L YSIA NASSIDES. 
NATATORIA. 
Specific character .— Third segment of the pleon produced on each side 
into a tooth, which is directed upwards and backwards, at a right angle with 
the inferior half of the posterior margin. Inferior antennae more than half 
the length of the animal. 
Length \ inch. 
Anonyx denticulatus. Spence Bate, Eep. Brit. Assoc. 1855, p. 58. Ann. 
Nat. Hist. 2 ser. vol. xix. 139 (Feb. 1857.) Cat. 
Amph. Brit. Mus. p. 74, pi. xii. fig. 2. White, 
Pop. Hist. Brit. Crust, p. 171. 
The animal is proportionably long, and in general fonn 
bears a considerable resemblance to Anonyx ampulla , from 
wbicb it may be readily recognized by the posterior mar- 
gin of the last deep segment of the body being produced 
on each side backwards and upwards into a long flat 
tooth. The eyes in this species have not been observed 
by us, having only seen dead specimens. The superior 
