214 BULLETIN 120, UNITED STATES NATIONAL MUSEUM 



and diminishing rapidly in size from first to fourth; in specimens of 

 medium size they surpass the chelipeds; merus with a short spine at 

 distal extremity. 



Measurements. — Male (18671), length of carapace to base of horns 

 95 mm., width of carapace 79.5 mm., length of cheliped extended 

 about 39.4 cm. or 153^ inches; entire width of crab with chelipeds 

 extended, about 83.6 cm. or 33 inches; length of merus of cheliped 

 17.5 cm.; length of propodus of cheliped on upper margin 16.2 cm.; 

 length of same on lower margin 20.6 mm. 



Range. — East coast of North America between 40° N. latitude 

 and Florida Straits. Depth, 70 to 334 fathoms. 



Material examined. Seo, table, pages 212-213. 



ROCHINIA HYSTRIX (Stimpson) 



Plates 70 and 71 



Amathia hystrix Stimpson, Bull. Mus. Comp. Zool., vol. 2, 1871, p. 124 

 (type-locality, off Sand Key, l^lorida, lat. 24° 16' 00" N.; long. 81° 42' 

 00" W., 137 (corrected from 138) fathoms; type not extant). — A. Milne 

 Edwards, Crust. Reg. Mex.. 1878, p. 134; 1879, p. 200, pi. 28, figs. 1-1 b; 

 Bull. Mus. Comp. Zool., vol. 8, 1880, p. 2. 



Anamathia hystrix Smith, Proc. U. S. Nat. Mus., vol. 7, 1884 (1885), p. 493; 

 Kept. U. S. Commr. of Fish and Fisheries for 1885 (1886), p. 626.— 

 Rathbun, Proc. U. S. Nat. Mus., vol. 17, 1894, p. 61. — Faxon, Mem. 

 Mus. Comp. Zool., vol. 18, 1895, p. 10. 



Scyramathia hystrix Rathbun, Bull. U. S. Fish Comm., vol. 20 for 1900, 

 pt. 2 (1901), p. 62. 



Diagnosis. — Median spines 4; gastric spines 4; spines of rostrum 

 and carapace long and slender; one spine on basal antennal article; a 

 slender spine at angle of buccal cavity, and at extremity of merus of 

 ambulatory legs. 



Description. — Carapace covered with a short, dense, vesicular 

 pubescence, and armed with 16 long, slender spines — 2 rostral; 4 

 median, of which 2 are gastric, 1 , cardiac and 1 intestinal; 1 gastric 

 spine on either side of the median line; 1 marginal hepatic (paired); 

 3 branchial (paired) of which 1 is oji the margin. The preocular 

 spine is slender and much shorter than the other dorsal spines; 

 postocular lobe slightly developed. Basal antennal article with a 

 spine at the antero-external angle, while a longer spine is situated at 

 the antero-external angle of the buccal cavity. 



Chelipeds slender and weak, very little stouter than the ambulatory 

 legs and shorter than the first two pairs; merus cylindrical and with a 

 terminal spine; carpus with an external spine; manus slightly com- 

 pressed, widening distally; fingers toothed throughout their length, 

 very narrowly gaping. First ambulatory leg much the longest. All 

 are very slender, and the merus terminates in a spine. 



