Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 121 



Color : The body is, sandy brownish with a distinct rose shading, 

 according to the field-notes of Mr. Vanderbilt. Field-notes of the 

 late John B. Henderson, 2nd, state that the claws are pinkish brown 

 with a suggestion of banding. 



Technical description : Carapace widely, ovately triangulate, with 

 the upper surface rough, the regions deeply delineated. The rostrum 

 is a median triangulate tooth, deeply channelled on the upper surface, 

 with a small tooth on either side of the median one above and slightly 

 in advance of the eye ; posterior to this there is a tubercle on the 

 superior orbital margin which is approximately in line with the post- 

 orbital angle which forms a prominent tooth ; the anterolateral mar- 

 gins are cut into ten sharp, slightly unequal teeth, each of which is 

 denticulate on the margins. The first one of these teeth is on the 

 sharply defined hepatic region; the tenth tooth is at the lateral angle 

 and is longer than the others; posterior to this at the end of the 

 branchial ridge is another strong, acuminate, outward directed spine ; 

 the postlateral margin has three or four small spines and there are 

 five on the posterior margin, of these the median is distinctly the 

 largest. The hepatic region is sharply defined ; the cervical groove 

 is remarkably deep ; the branchial region is elevated and separated by 

 deep groove from the cardiac; there is a strong ridge running 

 obliquely in from the strong branchial tooth and bearing two strong 

 and several lesser spines and tubercles ; other small tubercles and 

 granulations occur on the branchial region and other parts of the 

 carapace. The gastric, cardiac and intestinal regions are elevated; 

 the rostral channel runs back onto the gastric region which bears three 

 pairs of small tubercles and behind these one strong, up-pointing 

 spine; posterior to and in line with this are another three similar 

 spines, one on the summit of the cardiac region, one on the gastric 

 summit which has posterior to it a smaller but distinct spine ; the 

 previously mentioned large median spine of the posterior margin is 

 in line with the foregoing spines and followed by the produced tri- 

 angulate median spine on the first and second abdominal segments, 

 each of which has a line of small tubercles on either side of the median 

 tooth. The third, fourth and fifth and sixth abdominal segments of 

 the male also are ornamented with a single median spine, which, on 

 the third and fourth segments is flanked with smaller tubercles. The 

 pterygostomian region and subhepatic region bear a line of spinous 

 tubercles inferior to the marginal spines. 



