THE SPIDER CRABS OF AMERICA 291 



gin of the carapace. Pterygostomian region armed with 2 rows of 

 spines. MaxilHpeds and sternum smooth. Three spines on each of 

 first three abdominal segments of male. 



Manus nearly as long as merus, nearly smooth, a few spines near 

 articulation with carpus; merus and carpus rough with spines above 

 and below. In the old male (see Schramm's pi. 7), the fingers gape 

 for half their length, and there is a small but well defined molari- 

 form tooth on the dactylus wdthin the gape. 



Ambulatory legs long and slender; a few spines longitudinally 

 arranged on merus and carpus; dactylus long, stout, unarmed and 

 short-haired. 



The young and half-grown are covered with very short hair, while 

 the old are nearly bare except for the ambulatory dactyli. 



Measurements. — The largest male noted is that described by 

 Schramm: length of carapace including rostrum 120 mm., greatest 

 width 82, length of rostrum 22, of horns 18, of chelipeds 220, of 

 chelae 110, of movable finger 38, of first ambulatory 190 mm. 

 Length of youngest specimen, female (9688), 20.5, width 9.4, length 

 of horns 6.4 mm. 



Range. — From off Cape Hatteras, North Carolina, to Gulf of 

 Mexico and Windward Islands. Depth, 52 to 140 fathoms. 



Material examined. — Off Cape Hatteras, North Carolina; Alba- 

 tross: Lat. 35° 11' 30" N.; long. 75° 05' 00" W.; 59 fathoms; crs. 

 S. bk. Sp.; temp. 75° F.; October 21, 1884; station 2301; 1 male, 1 

 female (7256). Lat. 35° 08' 00" N.; long. 75° 05' 30" W.; 63 

 fathoms; gy. S. brk. Sh.; October 17, 1885; station 2595; 1 male, 1 

 female (14091). 



Gulf of Mexico: East of Delta of Mississippi River; lat. 29° 15' 

 00" N.; long. 88° 06' 00" W.; 60 fathoms; bu. M.; temp. 61. 8° F.; 

 Mar. 4, 1885; station 2386, Albatross; 1 3-oung female (9688). 



Windward Islands; 1879; U. S. C. S. S.^Blalce: 



Off St. Vincent: Lat. 13° 07' 55" N.; long. 61° 05' 36" W.; 124 

 fathoms; Co.; temp. 57.5° F.; March 3; station 269; 1 female (2865, 

 M. C. Z.). Lat. 13° 06' 45" N.; long. 61° 06' 55" W.; 87 fathoms; 

 Co.; temp. 62° F.; February 21; station 232; 1 ovigerous female 

 (2869, M. C. Z.). 



Off Barbados: Lat. 13° 05' 00" N.; long. 59° 39' 40" W.; 140 

 fathoms; Co. brk. Sh.; temp. 56.5° F.; March 10; station 299; 1 

 ovigerous female (2864, M. C. Z.); 2 males, 2 ovigerous females 

 (2866, M. C. Z.). Lat. 13° 02' 36" N.; long. 59° 37' 45" W.; 123 

 fathoms; R.; temp. 56.5° F.; March 10; station 297; 1 male (2867, 

 M. C. Z.). 



RemarJcs.—Pisa antilocapra appears to have been founded on a 

 young specimen of this species, while the type of P. praelonga was a 

 much smaller (scarcely 10 mm. long) and consequently narrower 

 specimen. 



