Ifotes on Noi'ih American Crustacea. 219 



Trapezia iiiaculata. 



Trapezia maculata Dana, U. S. Expl. Exped. Crust, i. 256, pi xv. f. 4. 



• Mr. Xantus has sent a specimen of this species, collected at 

 the Island of Socoro, off the west coast of Mexico. It was 

 originally found at the Sandwich Islands, and is one of the 

 very few species common to the American coast and the 

 eastern outskirts of the great Indo-Pacific region. 



Trapezia ni^ro-fiisca, nov. sp. 



Carapax broad, naked, slightly convex, very smooth and glabrous, with 

 a few scattered punctae surrounding the gastric region, though scarcely 

 defining it. A very slight marginal tooth on either side, at the usual 

 position. Front slightly convex, entire, not denticulated. Outer maxil- 

 lipeds fitting neatly in the buccal area, and not gaping ; basal margins 

 in a transverse line. Chelipeds with the meros short, as in Tetralia ; 

 carpus almost bilobate within ; hand very broad and depressed. Ambu- 

 latory feet short, naked ; dactyli with obtuse unguiculi sufliciently con- 

 spicuous, bent inward at an angle with the main part of this terminal 

 joint. Color uniform dark-brown, almost black. Length of carapax in 

 a male, 0.37 ; breadth, 0.46 inch. 



Cape St. Lucas. J. Xantus. 



IVeptiiiiiis. 



This genus was instituted by De Haan for a small group of 

 Zu^ae, species mostly pelagic in their habits, a8 Z. ^^elagica and 

 Z. sanguinolenta, which are the two mentioned by that author 

 as examples. It has been rejected by succeeding carcinolo- 

 gists, and re-united to Zupa ; but I believe it to be well cha- 

 racterized by the great breadth of the carapax, the little-promi- 

 nent front, the short meros-jointof the outer maxillipeds, which 

 is not produced beyond the base of the palpus, and is obtuse at 



