Boone, Crustacea, Cruise of ''Alva," 1931 45 



lobe and acuminate triangulate ; the second tooth is not only stronger 

 and longer but arises from a curved basal portion which places it in 

 advance of the inner tooth ; the third, outermost tooth, the largest one 

 of this series, is at the outer curve of the crest, with its inner side 

 relatively straight, its outer margin convex. The outer tooth of the 

 median lobe and the inner two teeth of the adjacent lobe, converge 

 their apices distally toward the eyestalk. The next or median lateral 

 lobe, which is conspicuously the longest and largest of the series, is 

 about as wide basally as the inner lateral lobe and is about twice as long 

 as wide, widening gradually distally, with the outer lateral margin defi- 

 nitely convex, the distal margin cut into three unequal, triangulate teeth, 

 the outer two of which are a trifle broader than the more acuminate 

 inner one. The sinus between the inner and median lateral lobes is 

 very narrow. The outermost lateral lobe is the smallest one of the 

 series, separated by a fairly wide, V-shaped sinus, and consists of one 

 strong, outward directed triangulate tooth, which bears on the proxi- 

 mal half of its outer lateral margin two small, slightly procurved, tri- 

 angulate teeth. The lateral margins are carinate, the carina consist- 

 ing of a series of spinule-like granules. The frontal margin, especially 

 the interstices between the teeth and sinuses between the lobes, are 

 fringed with thick brown setae. Similar brushes of setae occur on the 

 upper margins of the chelipeds and on the inner margins of the 

 fingers. The sidewalls of the carapace are also furnished with large 

 patches of long setae. The lateral margins of the abdomen and of the 

 fourth and fifth pairs of legs are also heavily fringed with setae. 



The pterygostomian region is covered with small squamosities, 

 similar to those of the upper surfaces, but much smaller, and decreas- 

 ing in abundance posteriorly. The sternal plastron is free of these 

 squamosities, smooth except for scattered small granules. 



The male abdomen is narrowed triangulate and consists of seven 

 articles, the proximal four of which are dorsal in position ; the distal 

 three being bent under the body. The first article is the widest of the 

 series and is subequal in length to the second article, the third to sixth 

 articles are nearly subequal in length, the seventh article is small, 

 little more than half as long as the sixth, triangulate. The median 

 third of each segment, from the first to sixth inclusive, is elevated in a 

 wide, ridge-like longitudinal carina. The male organs consist of a 

 pair of elongated curved jointed rods, arising from the second seg- 

 ment, thickened proximally and tapered distally. 



