THE SPIDER CRABS OF AMERICA 



211 



Amathia agassizii Smith, Bull. Mus. Comp. Zool., vol. 10, 1882, p. 1, pi. 2, 

 figs. 2 and 3 (type-locality, off Charleston, South Carolina, lat. 32° 2.5' N.; 

 long. 77° 42' 30" W., 262 fathoms; type in Mus. Comp. Zool.); Proc. 

 U. S. Nat. Mus., vol. 6, 1883, p. 3; Kept. U. S. Commr. of Fish and Fish- 

 eries for 1882 (1884), p. 346 [2]. 



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

 493.— Rathbun, Proc. U. S. Nat. Mus., vol. 17, 1894, p. 60, pi. 1, fig. 4; 

 Bull. Lab. Nat. Hist. State Univ. Iowa, vol. 4, 1898, p. 254, pi. 1.— 

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



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

 493; Rept. U. S. Commr. of Fish and Fisheries for 1885 (1886), p. 624 

 [20], pi. 1, figs. 2, 3, 3a. 



Scyramathia agassizi Saks, Norske Nordhavs Exped., Crust., vol. 1, 1885, 

 p. 274. 



Diagnosis. — Median spines 6; gastric spines 6; a prominent 

 tooth at angle of buccal cavity; 2 spines on basal antennal article; 

 a stout spine at extremity of merus of ambulatory legs. 



Description. — Carapace very convex in both directions with a 

 tendency to median carination; surface pubescent. Median spines, 



6 (2 gastric, 1 genital, 2 cardiac, 1 



intestinal) ; a spine (paired) beside 



each of the median gastric spines; 



the anterior of the median spines 



forms the first of an oblique row 



extending backward to the spine 



at the lateral angle of the bran- 

 chial region ; a prominent, marginal 



hepatic spine; three small spines 



form a triangle on the inner portion 



of the branchial region. Above the 



posterior margin there is a small 



spine on each side of the middle, 



and over the bases of the last two 



legs, a row of six or more spinules ; 



above the anterior of these an 

 irregular row of spines extends forward to the anterior angle of the 

 buccal cavity. Spines of rostrum stout, gradually tapering, acumi- 

 nate, diminishing in length with age. There is a preocular spine, a 

 well-developed postocular lobe, and on the upper orbital margin 

 a small tubercle. Basal antennal article with two spines on the 

 outer margin, pointing doAvnward, forward, and outward. 



Chelipeds long, slender, tuberculate, becoming much stouter and 

 more elongate in the old. Merus with a distal spine and one or more 

 spinules near tlie proximal end. Manus slightly compressed and 

 distally enlarged. Fingers gaping at base, a tooth on the dactyl in 

 the gape; prehensile edges furnished with stout teeth. ^Vmbulatory 

 legs slender, much shorter than the chelipeds in very large males, 



Fig. 83.— R o c h I X I a 



CRASSA, FRONT AND 



ORBIT, X 1.5. (After 

 Rathbun) 



Fig. 84.— R o c h I n I a 



CKASSA, MALE (11213), 

 MAXILLIPED, X 2.9 



