CANCROIDEA. 241 



breadth, sixteen lines; ratio of length to breadth, 1 : 1-4. This species 

 has not the close-set tubercles of the ursulus, nor its division of the 

 frontal hairs into five groups. The hand is without spines, and thus, 

 as also, in other respects, it differs from the lanatus. The front between 

 the outer antennae is two-lobed, the lobes entire, and slightly arcuate 

 in outline. The teeth of the antero-lateral margin are large and tri- 

 angular, but are not visible until the hairs are removed. 



GENUS PILUMNOIDES, Edwards and Lucas. 



The ridges on the palate in Pilumnoides, are very distinct. The 

 body in the known species is quite thick, with the areolets much sub- 

 divided, and the lateral teeth small and reflexed. The lateral margin 

 is rounded, instead of forming an angle between the antero-lateral and 

 postero-lateral parts. 



PILUMNOIDES PERLATUS, Edwards and Lucas. 

 Valparaiso, Chili. 



Length of carapax, seven and a half lines ; greatest breadth, nine 

 and a half lines; ratio of length to breadth, 1 : l - 27. The anterior 

 part of the carapax has a semicircular outline, and the antero-lateral 

 margin, which is narrow and reflexed, curves around upon the poste- 

 rior part of the carapax ; the whole area thus enclosed between the 

 front and this margin, has a transverse-elliptical outline, and is much 

 cut up into minor areolets, the normal areolets being subdivided. 

 The areolets 2 M, 3 M, 4 M are distinct in outline ; 5 L is much broken 

 into ridglets. The teeth of the antero-lateral margin are all small ; 

 five are larger than the others (D, E, N, T, S), and between each 

 there are one or two smaller, besides one or two posterior to S. The 

 anterior legs are very stout, and small tuberculous. The hand on the 

 outer surface has three slender costae ; the lower surface is smooth. 

 Front emarginate. 



Hepatm perlatus, PCEPPIG, Archiv fur Nat., 1836, 135, pi. 4, f. 2. 

 Pilumnoides perlatus, EDWARDS and LUCAS, D'Orb. S. A. Crust., p. 21, pi. 9, f. 1. 



Gl 



