Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 145 



slender, elongated subequal, the propodus is scarcely two-thirds as 

 long as the carpus and has the palm slightly swollen ; the fingers sub- 

 equal, almost as long as the palm, rounded, with the entire cutting 

 edges meeting, the tips rounded, and set with clusters of bristles. 



The second chelipeds are greatly enlarged and are unequal, the left 

 being much the larger. It is as long as the entire body. The basis 

 is strong, the ischium triangulate, wider distally and armed along 

 the anterior lateral margin with a double row of corneous spines; 

 the merus is long and very swollen, especially on the anterior margin 

 where the spines are longest and most prominent ; the carpus is three- 

 fifths as long as the merus, small proximally and swollen distally, 

 also with the spines longest and sharpest on the anterior side; the 

 propodus is as long as the carapace, including the rostrum ; the palm 

 occupying three-fifths of this length and being much swollen, its 

 height equal to three-fifths of its length, the upper lateral margin 

 armed with a double row or comb of corneous spines, below which the 

 upper half of the outer surface of the pabn is free of spines, but is 

 covered by an elliptical patch of dense setae; the remaining outer 

 surface being covered with rows of long, conical, corneous tipped 

 spines, which are also present on both fingers. The claw is so bent 

 that the fixed or propodal finger appears to be on the upper side, 

 while the hinged finger is on the outer, lower side; the fixed finger 

 is the shorter and is relatively straight, except for the curved tip ; 

 it is also thicker than the hinged finger which is slender, curved, its 

 tip crossing that of the fixed finger. There is an elliptical gap between 

 the fingers, which is practically filled by a dense brush of setae from 

 the cutting edges of both fingers. The weaker second chela is similarly 

 proportioned to the larger one, but is much less swollen, and its spines, 

 although corneous, are very small; the fingers are quite as long, or 

 even a little longer than the palm. 



The third, fourth and fifth pairs of legs are slender and set with 

 numerous stiff bristles; the ischium is three-fifths as long as the 

 merus; the carpus as long as the ischium; the propodus the longest 

 joint of the series, being a trifle longer than the merus, and armed 

 along its inferior lateral margin with a row of corneous spines; the 

 dactyl is short, only one-fourth as long as the propodus, acuminate 

 and setose. 



Synonymy. — Palaemon olfersi Wiegmann, Archiv. f. Naturg., vol. 2, 

 part 1, p. 150, 1836. — Greeff, in Sitzungber. Gesells. zur 

 Beforderung ges Naturw. Merburg. 1882, No. 2, p. 30. — Ort- 



