CRUSTACEA. 

 1/0 



Length of carapax, 21 lines; greatest breadth, 31 lines; ratio of 

 lemrthto breadth, 1 : H8. This speeies has the transverse linings of 

 i^parvulus, rising from the very thin trenchant or harsh edge 

 bounding or crossing transversely some of the areolets. But the form 

 is narrower and more convex; the anterolateral teeth are somewhat 

 peculiar and the hands are also different, besides wanting the 

 large basal tooth of the moveable finger. The female, although so 

 small is well furnished with eggs, proving that it has nearly or quite 

 its adult size. The fifth joint of the eight posterior legs is not pro- 

 perly hirsute on both margins, as in the parvidus. 



Xantho PARVULUS (Fabr.), Edioanh. 



Cape Yerd.es. 



The following are the characters of the specimens referred to this 

 species. Length of the carapax of a male, five lines; greatest breadth, 

 seven and two-thirds lines; ratio of length to breadth, 1 : 1/53. Front 

 nearly straight, emarginate. Carapax not shining, anteriorly areolate, 

 but areolets slightly prominent, and 2 M, 3 M, 5 L, 6 L, hardly dis- 

 tinct posteriorly, or altogether indistinct. Surface of areolets with 

 some interrupted transverse lines, like the anterior edges of the areo- 

 lets. Anterolateral margin thin, four-toothed or lobed, corresponding 

 to D, E, N, T, S; the first lobe most elevated in its posterior half and 

 rounded, and its inner angle (at the orbit) not salient; second lobe 

 truncate; third, subtriangular, but the posterior side much the longer; 

 fourth, more dentiform and narrower; all the lobes having the surface 

 somewhat granulous or uneven in surface, as seen under a lens. 

 Hand rounded above, surface faintly corrugate or uneven under the 

 microscope, and the same is true of the carpus ; outer surface not at 

 all costate. Moveable finger not channeled, and having in both sexes 

 a large -oblique basal tooth. Posterior eight legs rather slender, 

 fourth joint somewhat hirsute above, fifth hirsute above and below, 

 tarsus hirsute. 



Cancer par vulus, Fabr., Ent. Syst., ii. 451. 

 Xantho parvulus, Edw., Crust., i. 395. 



