292 CRUSTACEA. 



dian nearer than either median and the lateral. Anterior feet 

 nearly equal, carpus reticulate, rough with minute granules, long 

 acute within ; hand rough with granules, below transverse plicate. 

 Posterior feet having the margins of the joints dense ciliate, third 

 joint not denticulate above, tarsus nearly twice longer than broad. 

 Male abdomen nearly linear, penult segment not broader at base. 



Plate 18, fig. 3, animal, natural size. 



Length of carapax of a male, two inches and six lines ; breadth, 

 three inches and four lines ; ratio of length to breadth, 1 : 1'33. Co- 

 lour purple, in fine close dottings over the surface, becoming deep 

 purple along the posterior of the median region, which is convex pos- 

 teriorly and sublunate in outline; posterior to this for some distance 

 yellowish, and also yellowish near the antero-lateral margin. Carpus 

 reticulate with purple above. Other legs in part purple or reddish 

 purple ; tarsus of last pair having a middle of pale blue, a narrow- 

 border of purple, and the marginal hairs yellow and penult joint simi- 

 lar. The tarsus of the second pair of legs is broad lunate falciform, 

 with a triangular channel in the dorsal margin. 



In the male specimens of those in the collections, whose dimensions 

 are given above, the third joint of the second pair of legs has its 

 upper apical margin produced upward and cartilaginous at summit. 

 In a smaller female, two and a quarter inches long, this part is much 

 less prominent, and resembles the shell in its other part. 



The species is near the punctatus of De Haan (P. Jap., p. 44, pi. 1, 

 f. 2) ; but the two median teeth of the front are much nearer together 

 and farther from the lateral, the male abdomen is more linear, the 

 penult joint being no wider at base than at apex. The colour is yel- 

 low in the punctatus. 



II. TELPHUSINEA, OR CANCROIDEA GRAPSIDICA. 



THIS section includes, besides the recognised species, the genus 

 Orthostoma of Dr. J. W. Randall (Proc. Acad. Nat. Sci. Philad., viii. 



