4 S. I. Smith on Urazilicm Crustacea. 



vided by small notches into four lobes, the first of which is composed 

 of the angle of the orbit coalesced with the second normal tooth ; the 

 first lobe is broad, its edge slightly concave and projecting a little at 

 the angle of the orbit ; the second and third lobes are broad and trun- 

 cate ; the fourth lobe is small and obtuse and forms the lateral angle 

 of the carapax. From each of the notches slight sulci extend a little 

 way back upon the carapax. 



Beneath, the edge of the front is thin, projects obliquely downward 

 and is not expanded in front of the antenuulre. The epistome is smooth, 

 and its labial border has a prominent median lobe and a slight incision 

 each side. The external maxillipeds are smooth ; the merus is quadri- 

 lateral, its outer edge not projecting, and the antero-exterior angle 

 rounded. The inferior margin of the orbit is divided into two lobes 

 by a broad and shallow sinus ; the inner lobe forming a prominent 

 tooth which projects as far forward as the lateral lobe of the front, and 

 the outer lobe broad and slightly prominent. The external hiatus of 

 the orbit is rather broad and shallow. The sub-orbital and sub-hepa- 

 tic regions are quite granulous. The tubercle beneath the anterior lobe 

 of the antero-lateral margin is depressed, forming only a slight granu- 

 lous prominence. The sub-branchial region is somewhat hairy. The 

 female abdomen is broadly ovate, the greatest breadth being at the 

 fourth segment. 



The chelipeds are slightly unequal, the carpi and hands smooth and 

 evenly rounded above and on the outside. The hands are stout, the 

 fingers obscurely marked with longitudinal impressed lines, and irreg- 

 ularly toothed within, and in the dactylus of the larger hand there is 

 a prominent cylindrical tooth at the base. The ambulatory legs are 

 smootli and nearly viaked except a close pubescence upon the dactyli, 

 penultimate segments, and slightly on the carpi. 



In an alcoholic specimen the color is light bi-own above, tinged with 

 bluish purple on the anterior part of the carapax and the upper side 

 of the chelipeds. The fingers are black, lighter at the tips, and the 

 black not spreading iipon the palm. 



Length of carapax in the single female specimen, 13 '8™™ ; breadth, 

 21*4 : ratio of length to breadth, 1 : 1*55. 



Collected at the Reefs of the Abrolhos. 



The P. transversus Stimpson (Annals Lye. Nat. Hist., New York, 

 vol. vii, p. 210, 1860) of the west coast of Central America, differs 

 from this species in having the carapax much less distinctly areolated, 

 more regularly oval in outline and smoother and more evenly convex 

 above. The front also projects much less prominently ; the antero lat- 



