258 Bulletin Vanderbilt Marine Museum, Vol. VII 



The first pair of legs are small, chelate, typical of members 

 of this genus. 



The second pair of legs of the male are strikingly unequal, 

 the left one normally being greatly the larger, as shown in plate 

 102. In the female these legs are much weaker, being only slightly 

 unequal, as shown in plate 102. The male left (larger) cheliped 

 has the ischium weak looking, but extending as far forward as 

 the rounded anterolateral angle of the body; the merus, carpus 

 and especially the propodus are successively increasingly dilated ; 

 the merus being one and three-fifths times as long as the carpus, 

 evenly convex on the upper surface, less so ventrally, with both 

 inferior lateral margins increasingly spinose distally; a short, 

 oblique subdistal sulcus indents the inner surface of the merus. 

 The carpus is three-fourths as long as the merus, with the proxi- 

 mal end about the same width as the distal margin of the merus, 

 the carpus being abruptly dilated, with all surfaces, especially 

 the ventral, convex; the dorsal surface, also convex, is marked 

 by an oblique longitudinal depression which extends to the ante- 

 rior margin and is also confluent with the stronger transverse 

 subdistal groove ; the propodus is greatly dilated, the palm alone 

 being as long or longer than is the carapace from orbital angle 

 to posterior margin ; the palm is swung so that the fingers open 

 horizontally, the broad sides of the palm being dorso- ventral, the 

 normal upper margin forming the outer lateral margin, as does 

 the hinged finger, while the usual ventral margin of the palm 

 and fixed finger form the inner lateral margin. The two lateral 

 margins of the palm are subparallel, the wide upper surface being 

 evenly convex transversely, the ventral surface similar, but less 

 so ; there is a depression in the palm anteriorly, behind the base 

 of the hinged finger and extending obliquely posteriorly from 

 this pit is a much less, distinct yet definite groove, curving back- 

 ward and outward to the posterior margin of the palm. On the 

 ventral surface of the palm there is a definite transverse sulcus 

 anteriorly, behind the bases of the fingers, also, arising behind 

 the base of hinged finger there is a longitudinal sulcus which 

 curves inward posteriorly on the palm toward the basal angle. 

 The fingers are three-fourths as long as the palm, the attached 

 finger being diagonally deflected inward, with the distal contour 

 rounded to the acuminate, dentate apex. The hinged finger is 



