100 NOTES ON THE AUSTRALIAN AMPHIPODA, 



the superior antennpe are also more numerous. The posterior 

 gnathopoda are similar to those of L. nitens ; the telson is like- 

 wise deeply cleft, with a conical spine on each half. 



VIII. EUSIRUS. 

 EUSIRUS DUBIUS, Var. 



(Plate XIV., fig. 1). 



Eusirus duhius, Haswell, Proc. Lin. Soc. N.S.W , Vol. IV., 

 p. 331, pi. XX„ fig. 3 ; Cat. Aust. Crust., p. 247. 



The first and second pleonal segments have each five spines on 

 the posterior border. The fourth and fifth segments are dorsally 

 carinated — the carinae produced posteriorly into acute teeth. The 

 supei'ior antennae are as long as the cephalon and first three segments 

 of the pereion ; the first joint of the peduncle is stout, longer than 

 the head ; the second is about a third of the length of the first ; 

 the third is very small ; the flagellum is somewhat longer than the 

 peduncle, of 21 articuli ; the appendage is composed of 8 rather 

 elongate articuli. The inferior antennae are a good deal longer than, 

 the superior, nearly as long as the cephalon and pereion ; the 

 peduncle is stout, the fifth joint the largest, broad and laterally 

 compressed ; the flagellum is short, not so long as the last segment 

 of the peduncle, of 15 joints. The anterior gnathopods are large ; 

 the carpus has the palmar process about a fourth of the length 

 of the propus ; the propus is ovate, twice as long as broad, the 

 palm defined by a small tooth. The posterior gnathopods are 

 similar to the anterior pair, but larger. The posterior pleopods 

 have the rami ovate-lanceolate, acute, with a few serrations. The 

 telson is deeply cleft, each half ending in two acute spines, the 

 outer of which is more prominent than the inner. 



Length, exclusive of antenna?, about \ of an inch. 



Port Jackson. 



This variety differs from that originally described, which was 

 obtained in Tasmania, in the greater thickness of the inferior 



