Boone, Crustacea, Cruises of "Eagle" and " Ara," 1921-28 139 



Genus: PILUMNUS Leach. 

 Pilumnus brasiliensis Mieis. 



Plate 45. 



Type: A female taken by the "Challenger," near Bahia, Brazil, in 

 7 to 20 fms., and deposited in the British Museum. 



Distribution: Eare. Brazil; Porto Rico, at four "Fish Hawk" 

 stations off Vieques, 6 to 16 fms., off Culebra, 16 fms. ; Haiti. 



Material examined: One female taken at Carenge Bay, Le Mole, 

 Haiti, February 4, 1924. 



Technical description: Carapace moderately convex longitudi- 

 nally, 15 mm. long in the median line, 20 mm. maximum width; the 

 frontal margin is slightly more than one-third of the carapace total 

 width, consisting of a pair of wide, slightly rounded denticulated sub- 

 median lobes, separated by a shallow sulcus, from which there runs 

 back on the carapace a median groove. The preorbital angle is rep- 

 resented by a well-defined tooth; the superior orbital margin is un- 

 evenly denticulated or spinose. There is a sharp, acute tooth at the 

 postorbital angle. The anterolateral margin bears three acute, for- 

 ward-directed teeth in addition to the postorbital tooth. The regions 

 of the carapace are well defined, especially the urogastric line. The 

 dorsal surface of the carapace is microscopically granulate and is cov- 

 ered with stiff, short setae. The posterior margin of the carapace is 

 marked by a flat carina. The female belt is wide, oval, ciliated along 

 the margins. 



The eye has a rather long, granular, calcareous stalk which has a 

 tongue-like projection on the dorsal surface of the cornea; the latter 

 is large, spherical, black, terminal. 



The chelipeds are moderately unequal in the female, the left being 

 the larger ; the merus is decidedly trigonal, spinulose along the lateral 

 margins, with a distinct sharp tooth at the upper distal angle; the 

 carpus has the convex upper surface covered with sharp spines inter- 

 spersed with coarse granules and stiff setae; the palm is moderately 

 convex on the outer surface, about three-fifths as high as long, and 

 covered with coarse spines arranged in longitudinal rows, granules 

 and setae as on the carpus; along the upper lateral margin of the 

 palm the spines are larger. The fingers have deep setose grooves be- 

 tween the longitudinal ridges which latter are granulose. 



