Boone, Crustacea, Cruises of "Ara" and "Alva" 217 



of this species, represented by one of the largest specimens known 

 and a smaller male from off Fowey Rocks, Florida, in 100 to 200 

 fathoms, adds another Florida station for it. 



Material examined: Two males, taken in 100 to 200 fath- 

 oms, dredged from 4 to 2.5 miles off Fowey Rocks, Florida (bear- 

 ing true 289" to 273 true), November 29, 1935. 



Technical description : The larger male specimen has the 

 carapace 95 millimeters long, including the rostral horns, which 

 represent 6 millimeters of this total, the maximum width of the 

 carapace being 74 millimeters. 



The carapace is pyriform, very convex in both directions, 

 with a slight but definite median carina; surface pubescent; the 

 rostrum is prominent, deeply bifurcate. The greatest width of 

 the carapace is across the cardiobranchial regions, from which 

 point the postlateral margins are widely rounded and sinuate, 

 while the anterolateral margins are decidedly convergent to the 

 short, acuminate postorbital spine. The superior orbital margin 

 sometimes, but not always, bears a small spinule, which on the 

 larger specimen is reduced to a mere granule on the left side 

 and is obsolete on the right. The preorbital teeth are much 

 stronger than the postorbital ones, forming conspicuous, out- 

 jutting, eave-like, triangular processes above the eye and pro- 

 jecting forward and obliquely outward beyond the preorbital 

 margin. The remaining interorbital region is deflected and pro- 

 duced forward, forming a pair of very acuminate rostral horns, 

 separated by a wide U-shaped sinus, each horn being directed 

 slightly obliquely outward and extending as far forward as does 

 the antennal peduncle. The dorsad of the carapace is very tumid, 

 pubescent, with the regions sharply defined. The cervical and 

 hepatic grooves are very distinct as are also the deep urocardiac 

 pits, while paired sinuate longitudinal ridges accentuate the 

 cardio-intestinal grooves. There is a conspicuous median longi- 

 tudinal series of six large, upward directed, sharp spines which 

 are connected by a polished carina. The first of these spines 

 occurs on the mesogastric area, the second spine on the meta- 

 gastric area, the third, fourth and fifth spines on the cardiac 

 region, and the sixth on the intestinal region. The first and 

 second somites of the male abdominal belt are subdorsad and bear 

 respectively the seventh and eighth spines of this series, which 

 are each directed posteriorly. Transversely in line with the first 



