Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 83 



Type: Prof. Stimpson's type material was taken "off Carysfort 

 Reef, 52 and 60 fms., off Alligator Reef, 118 fms." These types are un- 

 fortunately no longer extant. 



Distribution: Known only from deep water, 52 to 150 fms., this 

 maximum depth having been established by the "Ara" specimens. 

 The species ranges from Cape Hatteras, N. C, southward to Florida, 

 the Gulf of Mexico, off St. Vincent and off Barbados. 



Material examined : One sof t-sheU male, two small males and one 

 large female, dredged in 150 fms., seven miles off Alligator Reef, Fla. 



Color: The "Ara'' specimen was deep red when captured. 



Technical description : Carapace pyrif orm, convex, very spinous, 

 rostrum long, horizontal, fused at the base but bifurcated the distal 

 four-fifths of its length ; each horn is very acuminate, slightly diver- 

 gent. The preorbital spine is very long, acute, upward and outward 

 directed ; behind it is a shorter, acute spine on the supraocular eave ; 

 there is a smaller, triangular tooth between the preocular eave and 

 the postocular cup, which latter terminates in a spine. There is a 

 spine at the angle of the buccal cavity and in line with this is a short 

 spine and a tubercle outside the proximal end of the basal antennal 

 article. The carapace is practically covered with upstanding, acumi- 

 nate spines of unequal size. The pterygostomian region has two rows 

 of spines. On the hepatic lobe there are several small and two or 

 three long spines ; one of these marginal hepatic spines is the longest 

 on the body posterior to the orbital spine. There are about 18 to 20 

 spines of moderate size with smaller spines interspersed; one of the 

 strongest of these spines occupies the summit of the gastric region and 

 is circled by the smaller spines. On the summit of the cardiac region 

 there is also a long spine surrounded by smaller ones ; there are four, 

 long, well-spaced spines on the intestinal region and a row above the 

 posterior margin. The first, second and third segments of the male 

 abdomen each bears three spines. The sternum has no spines and 

 there are none on the maxilliped. 



The male chelipeds are elongate, slender; the merus, carpus, and 

 proximal part of the propodus is spinous ; the remainder of the hand 

 is practically smooth. 



The ambulatories are long, slender, spinous on the merus and car- 

 pus ; the dactyl is long, stocky, stubby tipped. 



The largest "Ara'' specimen is soft shell, about 70 mm. long, includ- 

 ing the rostrum. 



