AUSTRALIAN MALACOSTKACA. 313 



slender, acute spine, and at the posterior end with a second spine 

 of similar form, but shorter ; second segment with a pair of short 

 spines a little behind the middle of its dorsal surface ; the rest of 

 the segments unarmed. Eyes oval, red. Superior antenna) more 

 than twice the length of the cephalon ; flagellum nearly as long 

 as the peduncle. Inferior antennae nearly as long as the peduncle 

 of the superior pair. Anterior gnathopoda small, about two- 

 thirds of the length of the cephalon. Posterior gnathopoda very 

 large, more than four times as long as the anterior pair ; basos 

 long, slender, armed with a compressed tooth at the distal end 

 of its anterior border ; carpus small ; propodos very large, of 

 irregular form, constricted at the proximal end, broader distally, 

 armed on the dorsal border with three very large, compressed 

 teeth, near the middle, and a small blunt tooth at the distal end ; 

 palm defined by a short acute tooth, and armed about its middle 

 with a sharp spine which is separated by a deep sinus from a broad, 

 compressed process occupying the distal third of the palmar 

 border. First pair of pereiopoda more slender than the two 

 posterior pairs, with the dactylos smaller ; dactyla of the 

 posterior pairs nearly as long as the propodos, palm defined by a 

 small tooth. Length | in. 



Clark Island, Port Jackson. 



536. Caprella cornigera. 



Caprella comigera, Haswell, 1. c, p. 317, pi. xxiii., fig. 5. 



Neck very long ; the other segments increasing in length to 

 the fourth ; fifth rather shorter than the fourth ; second, third, 

 and fourth segments each with a pair of cornua on the middle of 

 its dorsal border, and a short conical tooth at its posterior 

 extremity. Eyes small, round. Superior antenna? half as long 

 as the cephalon and pereion ; flagellum as long as the last segment 

 of the peduncle, of seven articuli, of which the first is very long. 

 Inferior antenna? very small, little longer than the first segment 

 of the peduncle of the superior pair ; flagellum as long as the last 

 segment of the peduncle, of four articuli. Anterior gnathopoda 

 small, propodos ovate, narrowing distally ; palm nearly longi- 

 tudinal, undefined. Posterior gnathopoda very large ; basos 

 longer than the cephalon ; carpus small, sub-triaugular ; propodos 

 nearly as long as the basos, narrow, palm nearly longitudinal, 



