256 ATTSTEAIilAlT MALACOSTBACA. 



borders smooth, truncate, and armed with a few straight hairs. 

 Telson with the segments compressed, terminating each in two 

 teeth, of which the inner is the more prominent, and armed with 

 several straight spines. Colour light green. Length i in. 



The female has the palm of the posterior gnathopoda straight, 

 and the meros of the two last pairs of pereiopoda narrower than 

 the male. 



Clark Island, Port Jackson ; Port Denison. 



This species resembles M. truncatipes, Spinola, in the form of 

 the posterior gnathopoda and other points ; but differs from it in 

 the form of the posterior pleopoda. From M. quadrimanus, Dana, 

 to which it is also nearly allied, it differs in the form of the basa 

 of the three posterior pairs of pereiopoda. Prom Mcera Mamsayi, 

 Haswell, to which it also has a singular superficial likeness, it 

 differs in the absence of spines on the pleon, and in the shortness 

 of the rami of the last pair of pleopoda. 



449. Mcera dentifera. 



Mcera dentifera, Haswell, 1. c, p. 332, pi. xx., fig. 4. 



Superior antennae equal in length to the cephalon and first four 

 segments of the pereion ; third segment of the peduncle two-thirds 

 of the length of the second ; flagellum as long as the last two 

 segments of the peduncle, of about ten articuli, each ornamented 

 like the peduncle, with several longish hairs ; appendage well- 

 developed, of five articuli. Inferior antennae slightly longer than 

 the superior ; fourth and fifth segments of the peduncle sub- 

 equal ; flagellum half as long again as the last segment of the 

 peduncle, of about twelve articuli ; both peduncle and flagellnm 

 armed with slender hairs, which are longer on the former. 

 Anterior gnathopoda small ; propodos ovate, palm not defined. 

 Posterior gnathopoda very large ; meros with a pointed process 

 at its inf ero-distal angle ; carpus short, sub-triangular ; propodos 

 about six times the length of the carpus, broad at the base, 

 narrowing distally ; palm two-thirds of the length of the propodos, 

 concave, with a low protuberance at its distal end, armed with 

 fasciculi of long hairs, and defined by a long spine-like tooth ; 

 dactylos nearly as long as the propodos. Rami of posterior 

 pleopoda scarcely larger than the others, lanceolate, armed with 



