148 RATHBUN 



PACHYCHELES MONILIFER (Dana). 



Porcellana monilifera Dana, Crust. U. S. Expl. Exped., i, 413, 1852 ; pi, 



XXVI, fig. 3, 1855. 

 Pachycheles vioniliferus Stimpson, Proc. Acad. Nat. Sci. Phila., x, 228 



[66], 1858. 



Mamanguape stone reef ; one specimen. 



Pernambuco stone reef at Ilha de Nogueira ; five specimens. 

 Stone reef at Boa Viagem, Pernambuco; nine specimens. 

 Color. — Light yellowish red, deeper on the chelipeds. 



PORCELLANA ROSEA sp. nov. 

 PL VIII, fig. 3. 



Length and breadth of carapace subequal. Carapace subtriangular. 

 The front viewed from above has a well-marked median tooth, and 

 between the middle and the orbit two sinuses. The orbit is very small 

 and has a preorbital and a postorbital lobe. The lateral margin is in- 

 terrupted by a slight notch at the cervical suture. Behind the suture 

 there is a well-defined, coarsely granulated margin set off from the 

 carapace by a furrow. This margin at a point far back on the 

 branchial region turns obliquely inward and backward upon the cara- 

 pace. The posterior margin has a deep median indentation. The 

 carapace is very convex in an antero-posterior direction, slightly con- 

 vex from side to side. A deep median furrow leads from the frontal 

 tooth to the mesogastric region, the anterior portion of which is faintly 

 outlined. On either side of the median furrow are two tubercular ele- 

 vations. From the notch anterior to the preorbital lobe a furrow runs 

 obliquely backward and joins the cervical suture, which is ver}^ deep. 

 The cardiac region is sufficiently distinct. A shallow furrow, curving 

 forward, crosses the branchial region transversely. The surface is 

 covered with large punctae bearing short bristles, and the branchial 

 region has scattered irregular tubercles. 



The merus of the cheliped has a blunt inner distal tooth; distal and 

 outer margins of upper surface bordered by acute tubercles. Carpus 

 with inner and distal margins thickened ; inner margin with a blunt 

 tooth at its proximal third; outer margin tuberculous, a somewhat 

 larger tubercle at the distal third ; upper surface very uneven, tuber- 

 culous and granulous, three tubercles much larger than the others. 

 The outer margin of the propodus is nearly straight for most of its 

 length, and is marked by sharp granules; the inner margin forms a 

 very prominent lobe behind the dactylus; the upper surface has four 



