284 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



Rochinia vesicularis (Rathbun) 

 Plate P, Fig. 6; Plate 31, Fig. 1 



Scyramathia vesicularis Rathbun, 1907, p. 73, pi. 5, fig. 7; pi. 8, figs. 1, 

 la. 



Rochinia vesicularis, Rathbun, 1925, p. 221, pi. 230. Crane, 1937, p. 58, 

 pi. 3, figs. 8, 9. 



Type: Male holotype, U.S.N.M. No. 32860, length 20.7 mm, width 

 11.5 mm. 



Type locality: Southeast of Hood Island, Galapagos Islands, 300 

 fathoms, Albatross station 4642. 



Localities subsequently reported, with collectors: Gulf of California, 

 Mexico: Gorda Banks, 40-100 fathoms, Zaca (Crane). 



Atlantic analogue: None. 



Diagnosis: Four median and four gastric spines. Rostral horns slen- 

 der, from one-third to two-fifths length of remander of carapace. Two 

 spines on basal antennal article and a spine posterior to these on orbital 

 margin. Walking legs with a distal meral spine. Male first pleopod much 

 like that of Scyra : a stout, pointed tip opposed by two lobate projections 

 with concavities approximated, an erect spinate lobe between them 

 directly above orifice. 



Description: Body and legs everywhere covered with a pubescence 

 formed of spherical vesicles ; a few long, slender hairs on the gastric 

 region, the lateral margins, and the rostrum. Carapace armed with 

 eighteen short, stout, and pointed spines, four on the gastric region, one 

 on the cardiac, one on the intestinal region, four on each branchial region, 

 one on each hepatic region, and one above each eye; in addition, the post- 

 ocular lobe narrow, curved, and acute. Rostrum composed of two slender, 

 divergent horns, two-fifths the length of the rest of the carapace. Eyes 

 visible even when retracted against the postocular lobe. The narrow basal 

 antennal article having an anteroexternal spine, and two spines further 

 back on the outer margin ; flagella situated outside the rostrum. Ischium 

 and merus of outer maxillipeds with a concave surface. 



Chelipeds of male just as long as the carapace and rostrum and little 

 stouter than the other legs ; arm with four short spines above, increasing 

 distally; wrist with three or four similar spines; palm with sides parallel, 

 one and one-half times as long as the fingers, fingers meeting when closed. 



Merus of all the ambulatory legs with a spine or tooth at the distal 

 end. First pair one and one-half times as long as carapace and rostrum. 



