286 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



Rochinia cornuta (Rathbun) 

 Plate Q, Fig. 6 

 Anamathia cornuta Rathbun, 1898, p. 571, pi. 41, fig. 2. 

 Scyramathia cornuta, Rathbun, 1907, p. 73. 

 Rochinia cornuta, Rathbun, 1925, p. 217, pi. 227, fig. 2. 



Type: Ovigerous female, holotype, U.S.N.M. No. 21572, length 50.2 

 mm, width 20.2 mm. 



Type locality: Northeast of Indefatigable Island, Galapagos Islands, 

 392 fathoms, Albatross station 2818. 



Localities subsequently recorded, with collectors: Off Hood Island, 

 Galapagos Islands, 633 fathoms, Albatross station 4641 (Rathbun, 

 1907). 



Atlantic analogue: None. A Galapagos endemic species. 



Diagnosis: Three median and three gastric tubercles ; two long paired 

 marginal spines. Rostral horns long, divergent, length equal to half or 

 more than half remainder of carapace. One spine on outer margin of 

 basal antennal article. A blunt distal meral spine on ambulatory legs. 

 Male first pleopod as in Pisoides: tip bluntly pointed, no lobate projec- 

 tions, but a compressed, spinulous shoulder on opposite side of subterminal 

 aperture. 



Description: Surface closely covered with tuberculiform cutaneous 

 vesicles, a few curved hairs among them. Tubercles and spines of the 

 carapace as follows: gastric region with three short [spines], one median, 

 the lateral in advance of the median ; cardiac and intestinal regions each 

 with one, short and conical ; branchial region with two short, the poste- 

 rior smaller and nearer the median line ; hepatic and branchial regions 

 each with a long, slender marginal spine directed outward, upward, and 

 forward. Rostral horns very long and slender, nearly equaling or exceed- 

 ing one-half the entire length of the carapace, and extending nearly to 

 the base of the rostrum ; slender, widely divergent, slightly arched. Pre- 

 orbital spine short, slender, not reaching the base of the rostral horns; 

 postorbital tooth rounded. Basal article of antenna with a short tooth or 

 spine at the anterolateral angle. Pterygostomian ridge with three or four 

 tubercles. A blunt rounded tooth at the angle of the buccal cavity. 



Chelipeds slender. Merus triangulate; outer face with a low blunt 

 ridge; upper margin with a sharp terminal spine, and a broad subacute 

 tooth near the proximal end. Carpus with a superior longitudinal uneven 

 crest, and a tubercle on the outer surface near the distal end. Propodus 

 compressed, with a thin upper edge; dactylus more than one-half the 



