334 ON SOME NEW GENERA AND SPECIES OF AMPHIPODA, 



rather broader distally than proximally, the palm transverse, 

 armed with three large compressed teeth; dactylos armed 

 internally with two teeth. Three anterior pairs of pereiopoda 

 subequal in length ; two posterior pairs longer ; basa of the three 

 last pairs more than half as broad as long, minutely serrated ; 

 mera broad, strongly convex behind ; meros, carpus, and propodos 

 serrated and hairy on the borders. Posterior pleopoda biramons, 

 the rami unequal, phylloid, the larger with three small notches 

 on its outer border, smooth on its inner ; the smaller with both 

 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 £ 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. 



Hal. Clark Island, Port Jackson. 



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 Ramsay i, 

 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. 



Mcera approximans, sp. nov. (PL XXL, fig. 3.) 



Pesembles M. dentifera, but has the posterior gnathopoda sub- 

 quadrate with the palm oblique, convex, defined by a small 

 conical tooth. 



Ha b. Clark and Shark Islands, Port Jackson. 



Mcera Pamsayi, mihi. 

 Melita(?) Eamsayi, Haswell, Proc. Lin. Soc. A\S.JF., p. 264. 



