Boone, Crustacea, Cruise of "Alva," 1931 137 



lated spinules set in longitudinal series, one of each pair on either 

 side of the median sulcus, the proximal pair of spinules being 

 about one-third of the telson length from base, the second pair 

 midway between the first and third pairs, which latter are on the 

 distal telsonic margin. The uropoda are about as long as the telson, 

 the outer blade the larger, widely rounded distally, and rather 

 truncated, the outer lateral margin thickened and terminating in 

 an acute tooth ; the inner blade is narrower, more convex distally ; 

 both blades are ciliate marginally. 



The great cheliped (female) is about as long as the related 

 carapace and has the extraordinary shape figured; the ischium, 

 merus and carpus quite slender, successively longer; the carpus 

 slender, small, cup-like, with the upper distal margin distinctly 

 excavate for the reception of the protruding convex distal end of 

 the palm; the lower distal carpal margin is also laminate-exca- 

 vate ; the palm is about as long as the related carapace and is much 

 thicker and higher proximally than distally, the proximal half 

 being distinctly dilated, convex, with the upper proximal end 

 rounded, protruberant, and with a circumscribed large irregular- 

 ly elliptical area on the upper and outer proximal surface; this 

 area narrower distally and extending about one-half the length 

 of the palm. Beyond this, near the dorsal of the outer surface of 

 the palm, there is a short oblique, irregular, nearly longitudinal 

 depression, which coalesces with a transverse depression that in 

 turn unites with an oblique depression on the inner surface of the 

 palm and this defines a distinct, dorsal, rounded hump, which is 

 followed by a deep, irregular pit, into which the closed finger end 

 fits and which is succeeded by the double-lobed dorsal margin of 

 finger, which margin is thickened, and on the outer side is sinuous, 

 defining a small denticle ; this is succeeded by a convex lobe, which 

 in turn is defined from the distal concave margin. On the inner 

 surface this distal margin is separated from a large, rounded lobe, 

 which is distinct from a small denticle, nearly opposite the base 

 of the upper finger, and which is succeeded proximally by another 

 larger node or lobe. Just above this node, on the distal border of 

 the palm, is a rounded circular area which interfits with a similar 

 flat, circular area on the proximal side of the finger below the 

 enlarged distal node. The finger is a T-shaped mallet with the 

 cross-bar much thickened and convex at both ends ; on the distal 

 side of the supporting center bar of the T, near its base, there is 



