CYMOrOLIA TUBERCULATA. 



39 



i-^ 



all three pairs of ambulatory appendages ; the carpi are carinatc on their 

 anterior iiiarginj with a vestige of a tooth at each end of the carina; the 

 anterior edge of the propodus is also carinate. The ambulatory legs are 

 ornamented with transverse bands of red, three of which cross the merus. 

 The abdomen and sternum arc granulated. 



Length, 13 mm. ; breadth, 18 mm.; length of ambulatory leg of second 

 pair, 34 mm. (merus, 9.3 mm. ; carpus, 5.6 mm.; propodus, 9 mm. ; dactylus 



7.5 mm.). 



Station 3355. 182 fathoms. 4 males, 1 fern. 



Ci/mopoUa zonata Rathb.,* lately described from the Gulf of California, 

 40 fathoms, differs from C. tuhercidata as follows : the carapace is narrower 

 and more quadrangular. The median lobes of the front are small and incon- 

 spicuous, while the lateral lobes arc very broad and are separated from the 

 median lobes by a slight, shallow notch. In (7. tiibcrciilala the four frontal 

 lobes take on the form of prominent, triangular teeth, clearly separated from 

 each other by deep triangular sinxises. The antero-lateral margin of the 

 carapace is three-toothed in (7. zonata, four-toothed in (7. ttibercvlaia. The 

 tubercles near the posterior margin of the carapace are more elongated in 

 the former species than in the latter. The hand of the former is much 

 broader, and is armed with pronlinent, spiny tubercles. Finally, the nieri 

 of the ambulatory legs are much shorter in (7. zonata^ and are armed at the 



r 



distal end with a blunt, triangular tooth, while in (7. Uibercidala this tooth is 

 transformed into a long, sharp spine, and a pair of smaller spines is present, 

 one on each side of the proximal end of the carpus. 



I _ 



The unique type specimen of Cymopolla dUatata A. M. Edw. f from St. 

 Kitts, 208 fathoms, has not yet been returned to this Museum. Judging 

 from Milne Edwards's short diagnosis, it must be very similar to C tiiber- 

 cnlata^ but in the latter the first sternal segment does not bear the trans- 

 verse crest which is said to be characteristic of C. dilatata. I am therefore 

 led to regard C tuhercidata and (7. dilaiata as closely allied representative 

 species on the two sides of the continent. 



* Proc. U- S. Nat. Mus., XVL 259, 1893. 

 t Bull. Mus. Comp. Zool , VIII. 28, 188Q. 



: 



