1 ! S Notes on North American Crustacea, 



tinal region, following the posterior margin. The pits on the frontal 

 and hepatic i-egions are elongated in a direction parallel with the 

 longitudinal axis of the body. The entire surface, except the bottoms 

 of the pits, is granulated. The margins are slightly waved, but no- 

 where distinctly toothed. The front does not project much beyond 

 the regular curve of the anterior outline. The frontal margin is 

 thick, and the eyes are small, and in our specimen are firmly imbed- 

 ded in their sockets, lying beneath the margin, so as not to be seen 

 from above. The intestinal margin is straight. Feet granulated. 

 Ghelipeds short, with a crest on the meros and one on the hand. 

 Ambulatory feet compressed, with a laminiform crest on the meros 

 joint, and two similar crests on the carpus and penult joint; this 

 penult joint is broadly expanded below, forming a process against 

 which the short dactylus retracts ; thus giving a subcheliform appear- 

 ance to the extremities of the feet. 



Dimensions of the female specimen : Length of carapax, 0.20 ; 

 breadth, 0.31 inch. 



Found at Panama by Capt, J. M. Dow. 



Uliliiis liiBitoatiis, nov. sp. 



Description of an adult female : Carapax broad, subelliptical, rather 

 sharply curved and almost angular at the sides, which are strongly 

 projecting. Upper surface coarsely and closely granulated, and 

 moderately convex, except towards the sides, where it is depressed as 

 in IT. ellipticus. The cardiac region is surrounded, except in front, 

 by a deep furrow, which posteriorly follows the posterior margin of 

 the carapax. There is also a deep circular pit on the posterior part 

 of the branchial region ; but there are no other well-defined pits, al- 

 though the swollen part of the carapax is surrounded on the sides 

 and in front by a shallow concavity, which deepens at its posterior 

 extremity on the branchial region. The lateral margins aie waved, 

 but not distinctly toothed. The postei'ior margin is slightly convex. 

 Ambulatory feet rather short and stout, not compressed, granulated 

 above and below ; penult and antepenult joints somewhat flattened 

 or even concave above, but not crested ; penult joint much less ex- 

 panded below than in L\ ellq^tlcus, and not forming so distinct a 



