46 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



Previous records: Gulf of California. Bahia de Tepoca, Sonora: 

 F. Baker (Schmitt). Bahia San Pedro, Sonora: S. A. Glassell (Glas- 

 sell 1937). Bahia Mulege: ( Lockington ) . Bahia Concepcion: S. A. 

 Glassell (Glassell 1937). Isla Coronados; Punta Lobos, Isla Espiritu 

 Santo: J. Steinbeck and E, F. Ricketts (Steinbeck and Ricketts). Off 

 Arena Bank: W. Beebe on Zaca (Glassell 1937). 



Diagnosis: Carapace nearly smooth, laterally plicate; a single epi- 

 branchial spine and a distinct supraocular spine; front sinuously tri- 

 angular; carpus a little over twice as long as wide, anterior margin 

 with five or six (rarely four) serrate-edged teeth; manus with a longi- 

 tudinal crest of large flattened granules; merus of walking legs with a 

 row of spines on anterior margin, that of legs 1 and 2 spined at 

 posterodistal angle. 



Description: Carapace nearly smooth except for light plications on 

 posterolateral regions; covered with a fine pubescence, longer in young 

 specimens. Front sinuously triangular, rounded at tip, with a deep 

 median groove; a strong supraocular spine, distinct even in the largest 

 specimens. Outer orbital angle produced into a spine. A single epi- 

 branchial spine. 



First movable segment of antenna with an anterior lamellar lobe, 

 granular on its margin and bearing a spine; second granular; third 

 nearly smooth; flagellum naked. Outer maxillipeds rugose. 



Merus of chelipeds roughly granular; anterior margin with a large, 

 serrate-edged, spine-tipped tooth. Carpus pubescent, a little over twice 

 as long as wide; armed on anterior margin with five or six (rarely 

 four) serrate, spine-tipped teeth similar to meral tooth ; a median longi- 

 tudinal row of large flattened tubercles, and a row of spines on posterior 

 margin. Manus granular, with a longitudinal crest of larger, flattened 

 granules extending from base of dactylus; surface pubescent, more 

 distinctly so to the outside of this crest; outer margin with a row of 

 enlarged granules, produced into spines in all but the largest specimens; 

 outer margin usually fringed with hairs. Dactylus with a row of large 

 flattened granules continuing the row on manus; gape of fingers with 

 a short pubescence. 



Walking legs rugose; anterior margin of merus with a fringe of 

 plumose hairs, all segments with long tufts of non-plumose setae; an- 

 terior margin of merus of leg 1 with seven to nine spines, of leg 2 with 

 seven to ten, of leg 3 with five or six; merus of legs 1 and 2 with one 

 or two posterodistal spines. 



