CYMOPOLIA TUBERCULATA. 39 



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

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

 anterior edge of the propodus is also carinate. The ambulatory leo^s are 

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

 The abdomen and sternum are 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 fem. 



C(/mopoUa sonata Eathb.,* lately described from the Gulf of California, 

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

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

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

 median lobes by a sliglit, shallow notch. In C. Uibcrculata the four frontal 

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

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

 carapace is three-toothed in C. sonata, four-toothed in C. tuhercvtata. 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 prominent, spiny tubercles. Finally, the meri 

 of the ambulatory legs are much shorter in C. sonata, and are armed at the 

 distal end with a blunt, triangular tooth, while in C. tuhercuhda 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. 



The unique type specimen of Ci/mopolia dilatata A. M. Edw. t 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. tul)er- 

 culata, 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. tvherculata and C. dilatata as closely allied representative 

 species on the two sides of the continent. 



* Proc. U. S. Nat. Mus., XVI. 259, 1893. 

 t Bull. Mus. Comp. Zool , VIII. 28, 1880. 



