120 



AMPHIPODA 



NATATORIA. 



GAMMARIDJ1. 



LYSIANASSIDES. 



\ 



CALLISOMA CRENATA. 



Specific character. Inferior antennas one-third the length of the animal. 

 First pair of gnathopoda having the dactylos developed into a thick brush of 

 short hair. Fourth segment of the pleon having on the dorsal surface a deep 

 notch. 



Length, ^ inch. 



Callisoma crenata. SPENCE BATE, Cat. Amph. Brit. Mus. p. 85, pi. 



xiv. fig. 5. 

 Scopeloclieirus crenatus. SPENCE BATE, Brit. Assoc. Rep. 1855, p. 58. 



Synop. &c., Ann. Nat, Hist. six. 138 (1857). 



WHITE, Hiat. Brit. Crust, p. 167. 



THIS species is very round and smooth, and rolls itself 

 up almost into a ball. The head is small, and anteriorly 

 produced into a minute flat rostrum, which is merely a 

 projecting portion of the skin, extending horizontally with 

 the top of the head. The antero-inferior angle projects 

 as far forwards as the extremity of the rostrum. The 

 eyes are small and reniform, showing black spots on a 



