356 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



Description: Carapace naked, tuberculated ; tubercles more or less 

 prominently granulated, most so in the young. Margin armed on each 

 side with a strong unguiform spine or tooth curved forward. Between 

 this lateral spine and the orbit two large, well-rounded tubercles, their 

 distance from each other about equaling their diameter ; the posterior one 

 larger and more prominent. On each side of the lateral spine (before and 

 behind it) a smaller marginal spine or sharp tooth. Front narrow; horns 

 of the rostrum short, blunt, scarcely more prominent than the anterior 

 tooth of the basal article of the antennae. This [article] triangular, 

 narrowing before, and armed on the under side of the orbit with another, 

 a lateral tooth, very small. A small tooth, posterior to this, scarcely 

 belonging to the antennal [article]. Pterygostomian ridge or margin 

 tuberculated. Merus of the external maxillipeds with a right-angled notch 

 at the inner apex for the insertion of the palpus. 



Chelipeds naked ; merus tuberculated ; carpus sparsely granulated ; 

 hand smooth ; fingers scarcely gaping, and unarmed within, except for a 

 tooth on the dactylus in old specimens. Ambulatory [legs] thick, sub- 

 cylindrical, nearly naked, short-spinose or granulated above, tomentose 

 below. (Stimpson, modified) 



Of the dorsal tubercles two pairs behind the rostral horns, followed 

 by a transverse row of five ; about seven large tubercles on the branchial 

 region, and two side by side on the intestinal region. Small, low tubercles 

 on the cardiac and mesogastric regions, and single granules on the 

 posterior and posterolateral margins. (Rathbun) 



The presence of an accessory spine in front of the last anterolateral 

 spine is a variable character within the species. This may be small, as 

 noted by Crane (1937, p. 61), or of equal size with the lateral spine, 

 as noted in a majority of Velero III specimens. In general, specimens 

 from the Gulf of California, near the type locality, Cape San Lucas, 

 have the accessory spine reduced or wanting, while specimens from the 

 Bay of Panama show it well developed. Two or three specimens in the 

 present series are asymmetrical with respect to this spine, having it on 

 one side but not the other. 



Material examined: 17 specimens from 13 stations. (See Table 71) 

 From Perico Point of Carmen Island, and Puerto Escondido, Gulf of 

 California, Mexico, to La Libertad, Ecuador. 



Measurements: Largest specimen, male: length 26.7 mm, width 

 including spines 32.2 mm, without spines 29.0 mm, rostrum 2.2 mm, 

 width 3.9 mm, cheliped 46 mm, chela 24.6 mm, dactyl 13.0 mm, height of 

 palm 10.0 mm, ambulatory legs 35, 32.5, 28, and 25 mm, respectively. 



