510 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 

 PILUMNUS QUOYI Milne Edwards 



Plate 206, Figures 1-4 



Pilumnus quoii Milne Edwards, Hist. Nat. Crust., vol. 1, 1834, p. 418 (type- 

 locality, Rio de Janeiro; type in Paris Mus.). 



Pilumnus quoyi A. Milne Edwards, Crust. Reg. Mex., 1880, p. 289, pi. 50, 

 fig. 5-5c. 



Diagnosis. — Wrists and hands covered with large shining spines. 

 Orbit entire above, spined below. Frontal lobes very arcuate. 



Description. — Dorsum covered with very stiff and spaced, short, 

 russet hairs, regularly placed and not concealing the surface. Cara- 

 pace very convex longitudinally, uneven, smooth, one and a fifth 

 wider than long (narrower than in A. Milne Edwards's figure); 

 antero-lateral border upturned, armed with three spines besides the 

 orbital; spines sharper than represented in figure; also a subhepatic 

 spine. Front consisting of two deep deflexed lobes with very arcuate 

 and granulate margin, and a small triangular outer tooth. Orbit 

 practically entire above though traces of two or three spinules remain ; 

 below five or six irregular short spines. Pterygostomian region 

 granulate. 



Merus of outer maxillipeds with the antero-internal angle truncate, 

 not emarginate. Chelipeds and legs very hairy, hairs longer than on 

 the carapace. Chelipeds very strong, unequal. Terminal and sub- 

 terminal spine on merus large. Spines or subacute tubercles of carpus 

 and manus very strildng, stout and shining; they extend ail over the 

 outer face of the minor palm and over the greater part of the major 

 palm. Ambulatory legs short, strong, wider than figured, and 

 unarmed. 



Measurements. — Male holotype, entire length of carapace 20.6, 

 width of same including spines 26, excluding spines 23.4 mm. 



Range. — Guiana (A. Milne Edwards) and Rio de Janeiro, Brazil. 



Material examined. — Rio de Janeiro, Brazil; Quoy and Gaimard 

 collectors; one male, unique type (Paris Mus.). 



PILUMNUS MIERSn A. Milne Edwards 



Plate 206, Figure 5 

 Pilumnus miersii A. Milne Edwards, Crust. Reg. Mex., 1880, p. 292, pi. 51, 

 fig. 3 (type-locality, Antilles; type in Paris Mus.). 



Diagnosis. — Five antero-lateral spines. Outer face of larger palm 

 smooth. 



Description. — Resembles in general form P. floridanus. It is 

 clothed with a very short down in which some longer hairs are 

 inserted on the feet. Carapace wide, smooth, regions scarcely indi- 

 cated. Front little advanced, edge granulate. Orbits with a few 

 small spinules above, below roughened with pointed granules or 

 spinules. Antero-lateral border armed with five spines, counting the 

 orbital spine; the fii'st two are very small and pointed, the others well 

 developed. Some subhepatic tubercles between the second and third 

 marginal spines. 



