30 A. 0. WALKER. 



with the hind margin produced backwards in a spur ; fifth and sixth with the 

 hinder angles acute ; seventh small and subquadrate. 



The first two pleon-segments have two long subdorsal teeth, as in the seventh 

 segment ; the lower margin of the first is narrowed, with the posterior angle obtuse ; 

 the hind margin of the second is concave with the posterior angle acute ; the third 

 segment is smooth with the posterior epimeral angle forming a short, blunt tooth and 

 a longer curved tooth above it. 



First segment of the urus dorsally depressed, much longer than the remaining two 

 united. 



Upper antmnse : First joint with a strong distal tooth on the inner side reaching 

 almost to the end of the second joint. 



First gnathopods with a chelate hand. 



Last three pairs of perseopods increasing in length successively, the last pair 

 extending much beyond the ends of the uropods ; hind margin of the first joints 

 smooth, more or less concave, and ending below in a subacute tooth. 



Telson reaching to the base of the peduncles of the third uropods, shorter than the 

 width at the base, rather deeply notched. 



I. HODGSONI. (PI. 11, fig. 18.) 

 I. hodjsoni, A. 0. Walker, Ann. and Mag. Nat. Hist. XVIII. (1906), p. 152. 



Coulman Island, 13 Jan., 1902, 100 fm., one. 



The whole body is clothed with fine spine-like teeth directed backwards and 

 arranged more or less in zones on the segments of the mesosome, pleon, and urus ; the 

 side-plates are also densely spinous, and appear to be a little deeper than the segments. 

 The body is but little compressed laterally and is widest about the first and second 

 segments of the mesosome. The antennse are rather short, subequal, and directed 

 outwards, the basal joints of the upper being a mass of branching spines. The rostrum 

 is almost straight and about as long as the rest of the head. Eyes round, darkish, and 

 far apart. 



Inner plates of the maxillipeds folded and squarely truncate ; outer broad and 

 rounded. 



The gnathopods resemble those of /. obesa, Eathke. 



Length '20 mm. 



The single specimen was only partially dissected. 



FAM. EUSIRID^E, G. 0. SARS. 



EUSIRUS PROPINQUDS. 

 Eusirus propinqiius, G. 0. Sars. 



W.Q., etc., various dates, very abundant. 



The only points of difference between this form and the type are as follows : The 



