54 Bulletin, Vanderhilt Marine Museum, Vol. II 



two rounded teeth; the entire fronto-orbital region densely hirsute 

 as is also the under frontal region; on the upper surface behind the 

 hirsute region, the narrow part of the carapace is naked, smooth, for 

 quite a distance behind which the narrow, convex surface is orna- 

 mented with small pearly granules, which are invisible to the unaided 

 eye except along the lateral margin where they are larger. There is 

 a strong, outward and upcurved spine on the posterior region of the 

 carapace in the median line, and slightly below it and outside it on 

 either side is a similar spine which is about three-fourths as long as 

 the median spine ; these three spines form an obtuse angle ; the median 

 spine is only half as high above the submedian spines as in P. 

 orbicularis. 



The male abdominal belt has the first, second and third segments 

 narrow, hinge-like, the third segment is closely fused with the suc- 

 ceeding segment but retains a weak line indicating the fusion; the 

 fourth, fifth and six segments are completely anchylosed ; the seventh 

 segment is small, subtriangulate, with the lateral margins convergent, 

 the tips evenly rounded. 



The chelipeds and ambulatories are similar to those of P. orbicularis, 

 but they are distinctly slenderer and the fingers of the chelae do not 

 gape. 



Both pairs of antennae are similar to those of the preceding species. 



The eye is conical, light brown and a trifle less hooded than in 

 orbicularis. 



The external maxillipeds are smooth externally, the tip of the 

 exognath broadly rounded; the tip of the merus of the endognath 

 narrowed, more so than in orbicularis; the external faces of both the 

 sets of meral joints of the maxilliped are densely tomentose. 



The tips of the septa of the branchial channels are not visible in a 

 dorsal view. 



Synonymy. — PersepJiona edwardsii Bell, Horae Carcinologicae, vol. 

 21, p. 294, pi. 31, fig. 8, 1855 ; Rathbun, Proc. U. S. Nat. Mus., 

 vol. 38, p. 595, 1910; Boone, Zoologica, N. Y. Zool. Soc, vol. 8, 

 No. 4, p. 284, text fig. 101, 1927. 



Persephona punctata Linn 6. 



Plate 10, fig. B. 



Diagnostic characters: Only member of the genus thus far de- 

 scribed from the West Indian region. Body globose, covered with 



