CUMACEA FKO.M THE COPKNUAGEX MUSEUM. 373 



antero-lateral tooth. The surface of the carapace is k)ngitudinally ribbed, much as iu 

 G. carinata, but the ridges are more numerous and some of them are ill-defined and 

 interrupted, so that it is difficult to make sure of their exact number and arrangement. 

 There is a shallow depression towards the front on each side of the carapace, and in 

 front of this, just behind the antero-lateral corner, is a short vertical ridge, forming a 

 small tubercle behind the antennal notch, and continued upwards on to the side of the 

 pseudorostrum. "N^'hen viewed from above, this ridge is seen to carry a series of thin 

 and transparent curved spines. The ocular lobe is about twice as broad as long. The 

 eye is without pigment. 



The pleural plates of the tliird free thoracic somite are produced in front and behind, 

 and the attachment of the posterior legs is as in G, carinata. The penultimate 

 thoracic somite has a pair of slightly marked dorso-lateral ridges. 



The abdomen is shorter than the cephalothoracic region. The penultimate somite 

 is little longer than the preceding. The last somite is flattened from above downwards 

 and a little broader than long. 



The telson is about three-fourths as long as the last somite. Seen from above its 

 breadth is three-fourths of its length, and it is bluntly pointed at the tip, which bears 

 two extremely minute setce or spinules. 



The antennules have the first segment of the peduncle as long as the other two 

 together and the second half the length of the third; the outer flagellum is composed 

 of two subequul segments; the inner flagellum has three segments and is shorter than 

 the first segment of the outer. 



The antennae are short, of four segments, the terminal one very minute ; each 

 segment carries a plumose seta. 



The first and second maxillipeds have long setae springing from the distal segments 

 as in G. carinata. 



The third maxilliped has no exopod ; the basis is slightly expanded, but not produced 

 distally, where it bears a series of long plumose setae; the distal segments are slender, 

 the carpus, propodus, and dactylus subequal. 



The first legs are stout and extend well beyond the pseudorostrum ; the basis is 

 about one-half as long as the distal segments together ; tlie carpus is a little less than 

 twice as long as the two preceding segments together; the propodus is half as Ion"- as 

 the carpus, and the distal third of its inner edge is oblique and bears a series of about 

 eleven smooth setae, about two and a half times as long as the segment from which 

 they spring; the dactylus is a little more than half the length of the propodus and 

 bears one very long and some short setae at the tip. 



The second legs have the basis about two and a half times as long as broad and as 

 long as the remaining segments together ; the ischium is so short as to be easily over- 

 looked ; the distal segments become successively more slender ; the dactylus is as long 

 as the propodus and bears a small claw-like spine and one or two setie at the tip. 

 VOL. XVIII. — PART IV. No. 5. — Filruary, 1911. ok 



