106 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



Chelipeds in the male robust; merus incurved and having an outer 

 spiny ridge ; carpus with a posterior spine on the upper side ; hand oblong, 

 incurved, palm inflated, fingers gaping at base and meeting along the 

 distal half or two-thirds of their length; generally several small, spiny 

 projections on the surface of the hand, more conspicuous along the edges, 

 especially the lower. In the female the chelipeds smaller and more 

 slender, the hands subcylindrical, and the fingers nearly straight. 



Legs very long and slender, and furnished with tufts of long setae, 

 those on the upper side being curved; dactyls slender, falciform, those 

 of the first pair about one-third the length of the propodi, and a little 

 more slender but not more curved than the others; in the two posterior 

 pairs the dactyls about one-half the length of the propodi. 



Abdomen of the male six- [segmented] from the fusion of the last 

 two [segments] ; first two [segments] visible from above; the first [seg- 

 ment] much wider but not so wide as the second ; the second, third, and 

 fourth [segments] decreasing successively in width but of nearly equal 

 length ; the fifth longer than the preceding and the sixth oblong, rounded 

 at the tip, and much longer than any of the others; the sides of the 

 abdomen behind the second [segment] concave and at the middle of 

 each [segment] a conical protuberance, the last [segment] bearing 

 traces of two. In the female the abdomen large and rounded and 

 composed of five [segments] from the fusion of the last three, fitting 

 loosely over the thin, laminate rim enclosing the greater portion of the 

 sternum. Sternum and ventral surface of the abdomen both hollowed out, 

 thus forming a quite capacious chamber for holding the ova. (Schmitt, 

 modified, after Holmes) 



Material examined: A total of 623 specimens from 133 stations, of 

 which 44 were in the Gulf of California. (See Table 15) From San 

 Miguel Island, California, to Magdalena Bay, Lower California; from 

 Angel de la Guarda Island to Isabel Island, Gulf of California ; Clarion 

 Island; Cocos Island, Costa Rica; Panama; Colombia. 



Measurements: Largest specimen, a male: length 33.6 mm, width 

 22.4 mm, rostrum 6.7 mm, cheliped 45 mm, chela 21.5 mm, dactyl 

 11.8 mm, height of palm 9.8 mm, first ambulatory leg 78 mm, second 

 63 mm, third 52 mm, fourth 45 mm. Ovigerous female: length 18.5 mm, 

 width 11.5 mm. The largest specimen on record is the 34 mm male 

 (not the type) reported by Lockington (1877c). 



Color in life: Dorsal surface of carapace clear, pale olive buff with 

 a broad solid band of carmine along each side. Two oblong patches of 

 carmine on cardiac region and two smaller patches on intestinal region. 



