104 NOTES ON THE AUSTRALIAN AMPHIPODA, 



of its pleural portion and a row of setules on the inferior border. 

 The eyes are long and narrow. The superior antennae are nearly 

 as long as the body. The first joint of the peduncle is as long as the 

 head and the first segment of the pereion : the second is longer 

 than the first and very slender : the third is very small ; the 

 flagellum is as long as the peduncle, of 38 articuli ; the appendage 

 has 6 articuli. The inferior antennae are a little longer than the 

 peduncle of the superior pair, the fourth joint of the peduncle is 

 the longest ; the flagellum is about equal in length to the last joint 

 of the peduncle, and is composed of 13 articuli. The anterior 

 gnathopods have the carpus and propus ovate — the palm not 

 defined. The posterior gnathopods of the male are unequal, the 

 right the larger ; the merus of both, as well as those of the anterior 

 gnathopods are produced below into an acute tooth ; the propus is 

 rather oblong, rather narrower proximally than distally, twice as 

 long as broad ; the palm is nearly transverse, but a little oblique, 

 defined by a strong acute tooth and armed with two blunter teeth 

 towards the base of the dactylus, the upper tooth being the larger 

 and bifid ; the dactylus is not abruptly curved, about half the 

 length of the propus. The left posterior gnathopod is a little 

 smaller than the right, with the teeth of the propus much less 

 strongly marked. The posterior gnathopods of the female (?) are 

 also unequal — the right the larger and having the palm defined by 

 a short acute tooth and armed with four or five denticles ; the left 

 without any teeth on the propus. The last two pairs of pereiopods 

 are very long, nearly as long as the head and pereion, with narrow 

 basa. The last pair of pleopods are of immense size, as long as the 

 head and the first four segments of the pereion, the protopodite as 

 long as the last two segments of the pleon, the rami more than 

 twice as long as the protopodite, ovate-lanceolate, with serrated 

 edges. The halves of the telson are long and narrow, with a deep 

 terminal notch. The total length, inclusive of the antennie and the 

 pleopoda, is 1;^ inch. 



This species bears a considerable general resemblance also to 

 Ifijera hamigera but the modification of the left posterior gnathopods 

 in this latter species is so special as to distinguish it very clearly. 



