﻿36 



proceedings of the [June, 1856, 



vault over the feet, an indistinct ridge running from the basal articulation of 

 the first pair of feet to the lateral angle of carapace. Sternal plate one-third 

 the breadth of the carapax, estimated from one lateral angle to the other, and 

 one-half its length granulated oyer almost its whole surface, twice as long as 

 broad. Abdomen of seven segments in both sexes, with transverse granula- 

 ted ridges, prominent on the three first, less distinct on the rest. 



Eyes with orbits circular, lower outer edge with a notch. 



External antennce of three basal segments of nearly equal length, the third 

 reaching the front and lying in the hiatus of orbit ; the terminal stem short 

 of few (3-4) segments. Epistoma moderate, twice as broad as long. Mouth 

 rectangular, nearly square. 



Feet of first pair, sub-equal, large, twice the length of carapax ; third seg- 

 ment, lying, when in repose, transversely to axis of body, projecting one-half 

 its length beyond lateral angle of carapax, triangularly prismatic, flattened 

 horizontally with acute edge posterior, upper surface slightly dilated as it 

 approaches articulation with fourth segment; hand as long as tm'rd segment, 

 triangularly prismatic, flattened horizontally with acute edge turned poste- 

 riorly when the hand is extended in aline with third segment, inferior surface 

 dilated as it approaches articulation with finger. Hand and carpus, when in 

 repose, flexed on third segment, the opposite tips being a small distance 

 asunder; all the edges of the first pair of feet are lined with granules, except 

 that on the hand, which runs to the top of the immoveable finger. 



Feet of other pairs, small, sub-equal, flattened vertically, edges granulated, 

 inferior one more distinctly ; tarsi conic, acute, as long as preceding segment, 

 tips of those of the second pair, when extended, reaching to the extremity of 

 third segment of first pair, and the extremity of the fourth segment attain- 

 ing the angle of the carapax. The vault of the carapax conceals the second, 

 third and fourth pairs when in repose, the fifth generally exposed behind the 

 carapax. 



Color. — Variable, carapax generally mottled with brown and green of dull 

 hues, hand greenish with a white band; one specimen was ivory white in 

 every part. 



Inhabits coast of South Carolina, where it was first found by Dr. T. L. 

 Burden about 1845, drawn up on a bit of sponge by a hook and line. Several 

 specimens have been since obtained. 



Dimensions. — Length 0.5 of inch, breadth 0.6 of inch. 



Postscript, June, 1856. — Since presenting the preceding paper to the 

 Society, Prof. James D. Dana, of New Haven, has published (Am. Jour. Sci. 

 [2] xviii. 430) a description, with a figure, of a new species of this genus, 

 which we transcribe here, illustrated by the same figure, which he has kindly 

 furnished. 



