Boone, Crustacea, Cruise of "Alva," 1931 169 



peds, being nearly half as wide, at its greatest or median width, 

 as long; the inner lateral convex margin being much wider on 

 the proximal half and correspondingly narrowed distally, the dis- 

 tal margin being nearly truncate, very little rounded; the outer 

 lateral margin is nearly straight with the distal tooth acute and 

 decidedly extended beyond the inner distal margin. The second 

 and third articles are slender, rod-like, cylindrical, together ex- 

 tending not quite so far as does the scaphocerite. The flagellum 

 is very fine, thread-like, extending beyond the great chelipeds for 

 a distance equal to one and one-half times the length of these legs. 



The first pair of chelipeds is very weak, slender, the tips of 

 the weak, pointed dactyli barely reaching to the base of the pro- 

 podi of the second pair of legs. 



The second pair of chelipeds is also remarkably slender for 

 these appendages, all joints except the propodi being stick-like 

 in their compressed slirnness. The ischium is five-sixths as long 

 as the merus and projects as far forward as does the distal angle 

 of the basal antennal article ; the merus is trigonal, with an acute, 

 subdistal spine at the inferior angle ; the carpus is nearly as long as 

 the merus, but is quite narrowed proximally and widened a little 

 distally, having a tooth at the inferior distal angle and a longer 

 subdistal spine at the upper and slightly inner angle. The pro- 

 podus has the palm rather evenly dilated, compressed cylindri- 

 cal, the maximum width of the palm being nearly one-third of the 

 length; the fingers are half of the length of the palm and are 

 quite slender, with the cutting edges meeting, several obscure, 

 sinuate, teeth present, the tips definitely deflected and moderately 

 incurved ; small tufts of setae occur near the tips of both fingers. 



The am.bulatory legs are slender ; the propodi carry articulate 

 spines in longitudinal series on the inferior lateral margin; the 

 dactyli are scarcely one-fourth as long as the propodi, curved, 

 acuminate, with no accessory spine on the inferior margin. 



References: Harpilius lutescens, Dana, J. D., U. S. Explor. Ex- 

 ped. Crust., vol. XIII, pt. 1, 1852, p. 576 ; Atlas, 1855, pi. 38, 

 fig. 4. — BORRADAILE, L. A., Ann. Mag. Nat. Hist., ser. 7, vol. 

 II, 1898, p. 386.— NOBILI, G., Ann. Mus. Napoli, I, t. Ill, 

 1901, p. 3; Ann. Sci. Nat. Zool., Paris, ser. 9, t. IV, 1906, p. 

 63. — BoRRADAiLE, L. A., Trans. Linn. Soc. Zool., ser. 2, vol. 

 XVII, 1914-21, p. 381 (this article printed September, 



