460 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



plumose setae elsewhere. Male second pleopod three-fourths as long as 

 first, tapering, tip corneous, concavity denticulate. 



Description : Carapace short and broad, with projecting lateral angles. 

 Surface punctate, much more finely than in Solenolambrus typicus. An- 

 terolateral margin long and convex, armed with eleven scarcely project- 

 ing, tridenticulate teeth, the middle ones broadest. The two anterolateral 

 margins together forming a regular arc [except] for the projection of 

 the rostrum. The posterolateral margin concave, [and] the posterior 

 margin short and slightly convex. Protuberances of carapace like those 

 of S. typicus, but stronger, their ridges crenulated. Gastric and cardiac 

 protuberances very tall, with strongly projecting apices, almost spini- 

 form but not acuminate. Ridge of branchial region convex forward and 

 crenulated, with a larger toothlet at the middle. Basal [article] of the 

 external antennae shorter than the next [article]. Eyes very small. 

 Afferent and subhepatic channels very deep, the ridge separating them 

 being prominent and very thin and sharp. No supplementary ridge on 

 the subhepatic region. External maxillipeds with hairy margins, and 

 with a tubercle near the inner summit of the ischium ; anteroexternal 

 angle of the merus less acute and prominent than in S. typicus; merus 

 with three or four strong tubercles on the external oblique ridge. 

 Sternum between the chelipeds concave, without tubercles. 



Chelipeds rather short ; merus seven-toothed before and behind ; car- 

 pus with five denticulated crests; hand with nine strong, subspiniform 

 teeth on the superior crest and the same number of tuberculiform teeth 

 on the outer and the inner edge of the lower surface ; on the inner edge 

 the teeth minute toward the base, but large on the outer half of the 

 hand. Surface of the hand between the toothed crests smooth; the 

 inferior surface and the interstices of the teeth of all three of the crests 

 pubescent. Hand expanded in width at the distal extremity, and the 

 dactylus when retracted exactly at right angles with the palm. Ambula- 

 tory [legs] compressed, glabrous; meri with acute, sparsely ciliated supe- 

 rior edge ; merus of the posterior pair obtuse below, without crest. 



Abdomen smooth. (Stimpson, modified) 



Material examined: 151 specimens from 42 stations. (See Table 101) 

 From Tepoca Bay, Gulf of California, Mexico, to Santa Elena Bay, 

 Ecuador, including Socorro Island of the Revilla Gigedo Islands. In 

 addition to the above, 5 specimens from 4 Galapagos Islands stations 

 (Garth, 1946). 



Measurements: Largest specimen, female: length 11.2 mm, width 

 14.6 mm, rostrum 0.6 mm, width 1.6 mm, cheliped 22.7 mm, merus 8.8 



