Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 81 



Color : Mr. Vanderbilt 's notes state that this species is deep oliva- 

 ceous green with claws orange red. 



Technical description : Although this species sometimes attains a 

 length of three and one-half inches, the present specimens are much 

 smaller and younger. The carapace is lyrate, with the rostral horns 

 practically contiguous, separated from each other by a narrow, but- 

 tonhole-shaped slit, the two horns forming a regular triangle with the 

 upper surface flattish and hirsute ; the preorbital margin is rounded, 

 the upper surface bears one well-defined sinus; the postorbital angle 

 is acute; it and the hepatic region are produced into a laminate ex- 

 pansion which has its outer margin rounded posteriorly and is sepa- 

 rated from the branchial region by a deep constriction; the lateral 

 margins of the branchial regions are moderately rounded and the pos- 

 terior margin is also broadly rounded. There is a series of tubercles 

 along the lateral margin terminating before they reach the hepatic 

 region; there are also a number of scattered tubercles on the upper 

 surface of the carapace, an irregular double row running from the 

 rostrum to the intestinal region where they converge and terminate 

 in a single large tubercle ; there are two well-seperated larger tubercles 

 in the median line between the two rows on the gastric region. There 

 are also one or two large tubercles on the summit of the branchial 

 region. The upper surface of the carapace and legs is furnished with 

 hooked setae which mostly occur in clusters of five or six. The basal 

 antennal article is narrowed very slightly distally, has the lateral 

 margins much thickened and granulate and the antero-external angle 

 a blunt node ; the first free article is rather thickened, granular, with 

 its outer margin dilated ; the third article is subcylindric, but a trifle 

 thicker than the flagellum which consists of about twenty articles and 

 extends beyond the rostrum. 



The antennulae have an unusually prominent, granulose basal arti- 

 cle and a large, subtriangular fossett into which the fleshy flagella 

 fold. 



The chelipeds are equal, of moderate size; the merus and carpus 

 elongated, tuberculose on the upper surface, the propodus is moder- 

 ately robust, the fingers about as long as the hand ; there is an approxi- 

 mately median longitudinal groove on the outer face of each finger. 



The first ambulatories are as long or a trifle longer than the cheli- 

 peds, slender, hairy and beset with many hooked hairs ; the dactyli are 

 furred and have acute horn-like tips. 



