198 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



carpus crested. Male first pleopod with thick, acute tip opposed by a 

 single grooved projection; between these two smaller lobes, one on each 

 side of opening. 



Description: Carapace lyrate to broadly ovate, tuberculate; four 

 median tubercles, two gastric (the anterior one small), one cardiac and 

 one intestinal ; two large branchial tubercles, and one protogastric tuber- 

 cle. A tuft of setae proceeding from each tubercle ; from the protogastric 

 pair two rows of curled setae running forward and inward ; upper surface 

 and margins of rostrum, as also the subbranchial regions, setiferous. Lat- 

 eral projections broad, the anterior one large and winglike, its anteroex- 

 ternal angle advanced in a tooth, its posterior margin nearly longitudinal ; 

 the posterior projection smaller, posterior end spiniform, anterior end 

 lobiform. Postorbital tooth broad, separated from the broad supraocular 

 eave by a narrow fissure. Outer margins of rostral horns subparallel, 

 convex near tips ; inner margins concave. 



The basal article of the antennae bearing a tooth at the anteroexternal 

 angle ; flagellum not reaching end of rostrum. A row of tubercles on 

 pterygostomian region. 



Chelipeds large and strong. Merus triangulate, margins cristate; 

 superior crest with three or more teeth ; outer surface crossed by a blunt 

 ridge. Carpus with two longitudinal crests ; upper surface with an oblique 

 ridge, outer surface uneven. Propodus very broad, compressed, and with 

 a superior crest ; inferior margin with a prominent posterior lobe. Fingers 

 in adult males widely gaping; cutting edges dentate; a large tooth near 

 base of dactylus. 



Ambulatory legs stout, obscurely tuberculate. (Rathbun, 1925, modi- 

 fied) 



Material examined: A total of 167 specimens from 43 stations or 

 localities, divided as follows: (See Table 35) 



Allan Hancock Foundation and related material: 150 specimens from 

 35 stations. 



Provincial Museum material: 6 specimens from 3 localities. 



Hopkins Marine Station material : 8 specimens from 3 localities. 



California Academy of Sciences material : 3 specimens from 2 locali- 

 ties. 

 From Dutch Harbor, Unalaska, to Monterey Bay, California. Lock- 

 ington's San Luis Obispo record needs verification. 



Measurements: Largest specimen, a male: length 35.5 mm, branchial 

 width 26.5 mm, hepatic width 24.0 mm, rostrum 7.5 mm, basal width 

 5.0 mm, cheliped 41 mm, chela 21 mm, dactyl 10.5 mm, ambulatory legs 



