126 DE. H. J. HATSrSEN OK THE INaOLEIELLIDiE, 



Second Pair of Thoracic Legs (fig. 25). — A little smaller tlian 

 tlie first pair. The first joint is slightly produced anteriorly ; 

 the four proximal joints almost similar to those in I. abyssi 

 but a little more slender, while the hand and the seventh joint 

 present excellent specific characters. The hand is slightly more 

 than twice as long as broad, increasing gradually in breadth 

 from the base to the heel, which is situated at the end of the 

 second third of the whole length. The free posterior margin 

 is almost as long as the palm, which presents (fig. 26) some 

 rather large irregular teeth, at the heel a rather long and thick 

 spine, and just in front of this spine a smaller spine originating 

 from the inner side near the margin. The sixth joint is twice as 

 long as broad. The seventh joint (fig. 26) has on the posterior 

 margin three robust oblique processes, the distal one the longest ; 

 the claw is slender, not marked off from the preceding joint. 



TMrd and fourth Pairs of Thoracic Legs. — These are rather 

 similar to the corresponding pairs of L. ahyssi, but differ in 

 some particulars. Almost all the joints are thicker (fig. 27) and 

 their sets3 a little more numerous; the fourth joint is only a 

 little shorter than the fifth and as long as the sixth ; the seventh 

 joint has the postero-inferior angle somewhat produced, but 

 rounded and terminating in a very short hair (fig. 28, tii.) ; 

 the claw is shorter and thicker than in I. alyssi, terminating in 

 two small diverging spiniform processes. 



Mfth, sixth, and seventh Pairs of Thoracic Legs. — These legs 

 are similar in structure, but the two anterior pairs (fig. 29) are 

 somewhat shorter and considerably more robust than the seventh 

 pair (fig. 31). They differ greatly from the corresponding paifs 

 in J. ahyssi in having the sixth joint a little longer than and as 

 thick as the fourth, and especially in the structure of the 

 terminal portion of the legs; the seventh joint is fused with 

 the claw, and both these elements form together a robust curved 

 "claw" (fig. 30), in which sometimes a very faint transverse 

 line indicates its constituting parts, and sometimes this line 

 could not be discerned. Eigs. 29 and 31, as compared with 

 figs. 15 and 17, show several smaller diflferences between these 

 legs and the corresponding pairs of T. ahyssi. 



Pleopods. — The plates (fig. 32, pi., and fig. 33) differ some- 

 what in shape from those of I. abyssi ; the upper (outer) margin 

 is only two-thirds as long as the lower one, the lower and the 

 posterior margin form with each other an acute angle, and 



