440 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



intestinal. A prominent tubercle at the summit of the branchial region, 

 also a few low tubercles on the branchial region and on the gastric 

 ridges leading to the rostrum. Anterolateral margin convex, about eight- 

 toothed ; teeth denticulate, becoming smaller anteriorly, the row con- 

 tinued on the subhepatic region; tooth at the lateral angle the largest. 

 Posterolateral margin concave, arched upward, with five small teeth and 

 a large upturned spine at the summit of the arch. Posterior margin 

 slightly convex, tuberculate. The supraorbital arch bearing a prominent 

 tubercle. Rostrum channeled, subtriangulate, deflexed at an angle of 

 about 45° . . . Sternum, abdomen, and merus of external maxillipeds 

 tuberculate. 



Chelipeds long, irregularly dentate on the margins, teeth denticulate, 

 a stout tooth on the lower side of the first [segment] ; faces of merus 

 with tubercles arranged more or less longitudinally ; hand with a distinct 

 ridge on the lower face, outer face somewhat tuberculous, inner face 

 smooth ; dactyl dentate on the outside near the base ; both fingers dentate 

 on prehensile edges; white at tips, in the right cheliped gaping at base, 

 in the left in contact. Ambulatory legs very short, narrow, flattened; 

 meral, carpal, and propodal [segments] with a denticulate crest above; 

 meral [segments] with a narrow, longitudinal groove below, edges of 

 groove denticulate; last two [segments] densely hairy underneath. 

 Surface pubescent. 



Male abdomen with seven segments. (Rathbun, 1893b) 



Material examined: 56 specimens from 17 stations. (See Table 94) 

 From Boca de la Trinidad, Gulf of California, Mexico, to Lobos de 

 Afuera Island, Peru, including Socorro Island of the Revilla Gigedo 

 Islands. For an additional 100 specimens from 12 Galapagos Islands 

 stations, see Garth (1946). 



Measurements: Largest specimen, female: Length 26.5 mm, width 

 including spines 37.3 mm, rostrum 1.5 mm, width 1.6 mm, exorbital 

 width 9.6 mm, cheliped 75 mm, merus 28.7 mm, manus 32.5 mm, dactyl 

 14.2 mm, height of palm 12.2 mm. Male specimen: length 15.6 mm, 

 width 21.1 mm, rostrum 1.3 mm, width 1.3 mm, exorbital width 6.0 

 mm, cheliped 42.5 mm, merus 15.0 mm, manus 20.1 mm, dactyl 6.8 mm, 

 height of palm 6.2 mm. 



Color in life: Frontal regions white, with greenish blue tint on center 

 and purplish tint on sides. Cardiac and branchial regions hazel ; marginal 

 teeth xanthine orange; intestinal region dull yellowish white. Eye light 

 greenish yellow, eyestalk white. Cheliped hazel with reddish xanthine 

 orange becoming lighter on teeth. Movable finger violet carmine to 



