1861.] MR. J. Y. JOHNSON ON A NEW CRAB FROM MADEIRA. 241 



antennse have their basal joints much elongated, and terminating 

 forwards in an obtuse tooth. The second joint is club-shaped, and 

 the third cylindrical. The anterior half of the internal antennse is 

 folded directly backwards when at rest. 



The sternum is minutely punctated, and its entire surface in the 

 male is set with longish stiff hairs ; in the female the hairs are chiefly 

 confined to the posterior portion. 



Feet. — First pair subequal, stout, and longer in the male than in the 

 female. Fingers black, marked with longitudinal furrows, and having 

 two or three large tubercles near the extremity of their prehensile 

 edges. Upper surface of hand marked with seven low longitudinal 

 crests or rows of tubercles, some of which bear minute spines ; and 

 in the female with a good deal of stiffish hair ; under surface minutely 

 punctated. The wrist has the superior surface studded with three 

 or four rows of short sharp spines with broad bases. The inner in- 

 ferior edge has two stout black spines, the strongest of which is near 

 the anterior extremity of the joint. The arm bears two sharp spines 

 on its upper edge near the anterior extremity, and these are sepa- 

 rated by a deep transverse furrow which crosses each of the adjacent 

 surfaces. Remaining feet slightly compressed, irregularly angular, 

 marked with longitudinal spinous crests, and clothed with long stiff 

 hairs. The last joint is remarkably long, spineless, but marked with 

 deep longitudinal grooves, in some of which is a dense line of hair. 

 The terminating spine is reddish. The order of length of the feet 

 in the male is 1,3, (2, 4), 5. 



Abdomen. — The third segment is the broadest in the male, the 

 sixth in the female. In both, the sides of the seventh segment are 

 somewhat sinuated. In the female the margins of the abdomen are 

 thickly fringed with hair, and the surface also bears a good deal of 

 shorter stiff hair. 



The measurements of two specimens, a male and female, are sub- 

 joined, the figures signifying inches. 



Male. Female. 



Carapace : Length 4f 4^ 



Breadth 7 6^ 



Feet : First pair — Length 7 5 



Width of hand 2 



Third pair 6|^ 5 



Abdomen : Total length 3 3| 



Width of third segment .... 1^^^ 

 Width of sixth segment. ... 1^ 



This species will take its place in the neighbourhood of Cancer pJe- 

 beius, Poeppig, a Ciiilian species, from which, however, it is distin- 

 guished by the stoutness of the first pair of feet, the less prominence 

 of the tubercular "spines on the hand, the greater prominence of the 

 middle tooth of the lobes at the margin of the carapace, the greater 

 abundance of hair, the absence of the scroll of white spots which paint 

 each side of the upper surface of the carapace in Cancer plebeius, and 

 the much greater unevenness of the carapace, arising from the deeper 

 cutting of the divisions between the regions. 



Proc. Zool. S0C.--I86I, No. XVI. 



