312 AUSTRALIAN MALACOSTRACA. 



longer than the cephalon, oval ; palmar border armed with a 

 fringe of hairs, and with two strong conical teeth near the apex, 

 and another near the base. Posterior pereiopoda sub-equal ; 

 propodos with a tooth on its anterior border. The form of the 

 posterior gnathopoda varies in different individuals, and the 

 cephalic spine is sometimes rudimentary. The female of this 

 species differs from the male only in possessing the ovigerous 

 plates. Length 7 lines. 



Port Jackson. 



Genus Caprella, Lamarck. 



Body cylindrical. Cephalon and first segment of the pereion 

 confluent. Pleon rudimentary. G-nathopoda subchelate. First 

 two pairs of pereiopoda absent ; three posterior pairs subequal. 

 First and second pairs of pleopoda rudimentary in the male; 

 the rest obsolete. 



534. Caprella tenuis. 



Caprella tenuis, Haswell, 1. c, p. 276, pi. xii., fig. 5. 



Cephalon elongated, the upper border terminating anteriorly 

 in an inconspicuous acute tooth. First segment of the pereion 

 longer than, second and third sub-equal with, the cephalpn ; the 

 rest shorter. Superior antennae as long as the cephalon and the 

 first two segments of the pereion ; flagellum as long as the last 

 two segments of the peduncle. Inferior antenna? longer than the 

 peduncle of the upper pair, ornamented below with a fringe of 

 long hairs. Propodos of anterior gnathopoda ovate, swollen. 

 Propodos of posterior gnathopoda two and a half times the length 

 of that of the anterior pair, narrow ; the palm defined by an 

 obscure tooth. Branchiae longish-ovoid. Pereiopoda stout, short, 

 increasing in length from before backwards ; the third pair as 

 long as the fourth and fifth segments of the pereion. Length 

 6 lines. 



Port Jackson. 



535. Caprella echinata. 



Caprella echinata, Haswell, 1. c, Vol. iv., p. 346, pi. xxiii., 

 fig. 2. 



Male.' Cephalon rather longer than fhe other segments, armed 

 on its dorsal surface a little behind the eye with a very prominent 



