Mr. J. Y.Johnson on a new Crab from Madeira. 497 



drate lobes, alternately broad and narrow ; the outer edge of each 

 lobe armed with three teeth, of which the middle one is larger. On 

 the broader lobes the lateral teeth are frequently bifid. The hind- 

 most lobe on each side has only one principal tooth, but there are 

 three or four small ones. This lobe passes into the posterior marginal 

 line of the carapace, and this line is beaded with a series of tubercles. 

 The front of the carapace has two dotted lobes or flattened teeth, with 

 a narrow triangular tooth projecting between and beyond them. The 

 superior margins of the ocular orbits are denticulated, and have a 

 strong triangular tooth over the inner canthus, which does not project 

 quite so far as the two principal lobes of the interocular front. The 

 margin between the two superior fissures is denticulated, but has no 

 predominating tooth. Inferior margin of the ocular orbit armed with 

 three teeth, of which the innermost is large and stout. The external 

 antennae 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 antennae 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 



Ann. $ Mag. N. Hist. Ser. 3. Vol. viii. 32 



