THE SPIDER CRABS OF AMERICA 451 



the dorsum (exclusive of the margin) numbering from 20 to 25. 

 Specimens up to a" carapace length of 91 mm. have more divergent 

 rostral horns than in typical /wrcato while the only specimens, two in 

 number, above that size have horns less divergent and relatively 

 shorter than in smaller specimens, and resembling except in length 

 those of typical /wrcaiof. Small and half grown specimens are rela- 

 tively wider across the orbits. 



Measurements. — Length of largest male (33462) from tip of horns 

 to tip of posterior spine 137, length of horn 25.6, width of carapace 

 including spines 110.7, length of cheliped about 315 mm. Length of 

 male (9373) from tip of horns to tip of posterior spine 91, length of 

 horn 25, wadth of carapace including spines 63.7, length of cheliped 

 88 mm. 



Color. — Dark red (Hay). 



Range. — From Beaufort, North Carolina, to Gulf of Mexico and 

 Caribbean Sea, to a depth of 278 fathoms; exceptionally below 50 

 fathoms. 



Material examined. — See table, pages 453-454. 



STENOCIONOPS CONTIGUA Rathbun 



Plates 162 and 163; plate 266, fig. 2 



Pericefa contigua Rathbun, Proc. U. S. Nat. Mus., vol. 15, 1892, p. 247, 

 pi. 32, fig. 2 (type-locality, Gulf of California, station 3005, Albatross; 

 holotype, Cat. No. 16067, U. S. N. M.). 



Stenocionops contigua Rathbun, Proc. U. S. Nat. Mus., vol. 21, 1898, p. 577. 



Diagnosis. — Rostral horns curved, contiguous. Basal segment of 

 antenna armed with a long spine. Three lateral spines on carapace 

 behind orbit. 



Description. — Shape of carapace and hairy coating similar to that 

 of furcata; lateral spines behind the orbit three, one hepatic, two 

 branchial. Protuberances of the dorsal surface partially concealed; 

 they are arranged as follows: Three sharp tubercles in a triangle 

 on the gastric region, the posterior one median and highest. On 

 each branchial region two spines or a spine and a tubercle in an 

 obUque hnc with the postero-lateral marginal spine, and a sharp 

 tubercle close to the postero-lateral border of the cardiac region. 

 Above the posterior margin a median spine, and in front of it and on 

 either side a tubercle w'hich may be sharp. The cardiac region may 

 be either smoothly rounded or surmounted by a sharp spine, and 

 there may be a spine, large in the old near the anterior border of the 

 brancliial region. Rostral horns curved, contiguous in the middle, 

 separated at base by a button-hole slit, terminal halves or less 

 moderately divergent. Only one spine on the basal antennal seg- 

 ment, situated on the anterior border and so elongate as to be visible 

 in a dorsal view. 



