AMP H IPOD A. 
29 
First maxillse normal. 
Maxillipeds as in I. pacijica , except the inner plates, which are oblong and almost 
as wide as the outer. 
First gnathopods: First joint widest in the middle ; wrist rather shorter than the 
hand, which is chelate with short spines on the immovable digit. 
Second gnathopods: First joint narrow, oblong, as long as the remaining joints ; 
wrist and hand subequal, the latter chelate with long plumose setse on the hind 
margin. 
First and second perseopods: First joint strong, widening distally ; second as long 
as the fourth ; third rather longer and produced behind. 
Third perseopods : First joint oblong, with a median ridge and five subequal teeth 
on the hind margin. In young specimens the spines are fewer and less equal. The 
side-plates are wider than deep, with a tooth directed backwards. 
Fourth- perseopods: First joint rather wider than in the third pair, with fewer 
and more unequal teeth, and the posterior angle very acute and upturned. 
Fifth perseopods: Side-plates small. First joint wider than in the fourth pair, 
with four unequal teeth on the hind margin, and the posterior angle still more acute 
and produced. 
First uropods: Rami subequal, shorter than the peduncle. 
Second uropods: Outer ramus two-thirds of the length of the inner which is rather 
shorter than the peduncle. 
Third uropods: Rami wide-lanceolate and subequal, longer than the peduncle. 
Telson emarginate, the outer angles reaching to the end of the peduncle of the 
third uropods. 
The nearest ally of this fine species is I. pulchridentata, Stubbing, from Heard 
Island, from which it differs in not having the lower ends of the first three pairs of sicle- 
plates forked, and in the numerous dorsal spine-like teeth on the seventh mesosome and 
three pleon-segments. 
I. longipes. (PI. 9, fig. 17.) 
I. longipes , A. 0. Walker, Ann. and Mag. Nafc. Hist. XVIII. (1906), p. 151. 
Goldman Island, 100 fm., 13 Jan., 1902 ; one, length 30 mm. (not dissected). 
Mesosome wide ; pleon and urus compressed. Head, exclusive of the rostrum, 
longer than the first segment; rostrum fully as long as the rest of the head, deflexed 
and pointed ; ocular lobe rounded in front and terminating below in a strong tooth 
directed downwards. Eyes round-oval, dark, widely separated. 
First segment considerably longer than the second (which is the shortest of all) and 
subequal to the sixth ; third, fourth, and fifth shorter than the first and subequal ; 
seventh as long as the fifth and sixth united, with two long subdorsal teeth directed 
backwards. The first side-plates are rather deeper than the segment, much expanded 
below and rounded; second and third bluntly pointed ; fourth sharply pointed below, 
