CUMACEA FEOM THE COPENHAGEN MUSEUM. 365 



as long as the last somite and two and a half times as long as broad, while its vertical 

 thickness is little more than half its width. The cndopod is about three-quarters as 

 long as the peduncle, and its width near the base is about one-third of its length ; it 

 has seven spines on the inner edge, a longer terminal spine, and a small spinule external 

 to the latter. The exopod is distinctly shorter than the endopod, with two slender 

 terminal spines and one spinule each on the inner and outer edges. 



Younq Specimen. — In a very young specimen only '9 mm. long, which I suppose to 

 belong to this species, the flattening of the uropods is still more marked, the peduncle 

 being little longer than broad, while the endopod is only about twice as long as 

 broad. 



Remarks. — In spite of its small size, the larger of the two specimens described 

 above appears to be a])proaching maturity, aud we may therefore assume that the 

 broadened form of the uropods, though less marked than in the young, does not 

 disappear in the adult. 



Occurrence. — Gulf of Siam, " Koh Kam, 10 fathoms, 4/2/00," "Between Koh 

 Mesan and Cape Liaut, u-8 fathoms, 7/2/00." Th. Mortensen Coll., Copenhagen 

 Museum. 



Caupylaspis okientahs, sp. n. (Plate XXXV. figs. 1-5.) 



Description of adult Female. — Total length o'-j mm. 



Closely resembling C. rubicunda Lilljeborg, as described by Sars. The pseudo- 

 rostrum is very short and truncated as seen from above. The ocular lobe is longer 

 than broad and the eye is indistinct. The abdominal somites are not depressed and 

 are without lateral carinie. The terminal segment of the first maxillipeds is larger 

 than in Sars's figures. Third maxillipeds differing considerably from those of 

 C. rubicunda; basis much longer than the distal segments together ; ischium slightly 

 produced internally ; merus not greatly expanded, not wider than ischium, its inner 

 edge straight or slightly concave, not nearly equal to the two succeeding segments 

 together ; propodus much longer than carpus. None of the segments are conspicuously 

 serrated on the margins. First legs with the merus not expanded, hardly longer than 

 the carpus. Second legs with the terminal segment shorter than the two preceding 

 segments together, stouter than in C. rubicunda, with a long terminal seta. Uropods 

 with peduncle about twice as long as last somite, not serrated internally ; endopod 

 about half as long as peduncle, with about eight spines on inner edge, terminal spine 

 stouter than in C. ruhiciuida. 



The specimens retain traces of a reddish-purple colour. 



Bemarks. — The resemblance of the specimens described above to C. rubicmula is so 

 close that I should have been inclined to identify them with that species had it not 

 been for the difference in shape of the third maxillipeds. 



Occurrence. — "Korea, 3-') fathoms, 22/1/82, Suenson Coll." Copenhagen Museum. 

 VOL. xviii. — PART IV. No. 4. — February, 1911. o d 



