266 MB. &. M. THOMSON" ON THE OCCTTRKENCE OP 



The Jirst maxillcs resemble the same organs in C. australis, 

 having two masticatory lobes, of wliicli the outer is the broader, 

 and is armed with about eight spines, while the slender inner one 

 has four curved spines. The palp is long and very narrow, and 

 bears two long extremely slender setse ; it projects backwards 

 from the base of the outer masticatory lobe. 



The second maxillcd are two-jointed, the basal portion being 

 the larger. Its outer margin is nearly straight (not expanded as 

 in G. australis), while its inner margin forms a rounded cutting- 

 edge, fringed with numerous setae. The second segment is also 

 fringed with setse, which are so numerous as to make it difficult 

 to distinguisli the plate-like palp, which is also setose on its 

 margin. 



The maxillipeds have tlieir outer portion curved inwards, so 

 that each appears like two plates standing alongside of and at 

 right angles to one another. The general appearance of these 

 organs is very similar to those of C. australis. The basal portion 

 bears on its inner edge seven longisli setae, of which the anterior 

 four are more or less plumose. The palj) (PL XVII. fig. 11) is 

 4-jointed, the third joint bearing on its inner edge a row of stout 

 bideijtate teeth. The narrow penultimate joint bears two plumose 

 spines at its outer angle, while the minute terminal joint ends in 

 three short spines. The hrancTiial apparatus is difficult to dissect 

 out on account of its extremely fragile nature ; it resembles the 

 corresponding organ in C. australis, but the branchiae themselves 

 are longer than are represented in the figures of that species ia 

 the ' Challenger ' Cumacea. 



The Jirst gnatJiopods (fig. 12) are 5-jointed. The basal joint 

 is about twice as long as all the remaining four ; it is elongated 

 in shape, its length being four times as much as its greatest 

 breadth ; near the extremity of its outer edge it bears a row of 

 (about eight) slender spines, and on its extremity two plumose 

 setae, one on each side, and a few slender spines. The second 

 joint is destitute of setae. The third has one plumose seta on its 

 outer extremity, and a row of about seven on its inner margin. 

 The penultimatejoint has three spines on its inner extremity, and 

 one plumose seta on its outer. The last joint is small and 

 narrow, and bears one strong and several slender spines at its 

 extremity. 



The second gnathopods (figs. 13 and 14) are more than twice as 

 large as those of the first pair. The basos is more than twice as 



