THE SPIDER CRABS OF AMERICA 545 



Material examined. — 



"California"; 1 ovigerous female (Copenhagen Mus.)- 



Off Guaymas, Mexico; lat. 27° 45' 00" N.; long. 110° 45' 00" W.; 

 20 fathoms; gn. M.; temp. 65.2° F.; March 31, 1889; station 3037, 

 Albatross; 11 males, 3 females, 2 young (17366, 18620). 



Off La Paz Bay; lat. 24° 18' 00" N.; long. 110° 22' 00" W.; 26.5 

 fathoms; brk. Sh.; April 30, 1888; station 2823, Albatross; 1 male 

 (18180). 



LEIOLAMBRUS NITEDUS Rathbun 



Plate 199; plate 281, fig. 1 



Leiolambrus nitidus Rathbun, Bull. U. S. Fish Comm., vol. 20, for 1900, 

 pt, 2 (1901), p. 80, text-fig. 12 (type-locality, Mayaguez Harbor, Porto 

 Rico, 12 to 18 fathoms; (holotype. Cat. No. 23776, U.S.N.M.). 



Diagnosis. — Carapace without strong marginal spines behind; 

 lateral spine large, involving half of antero-lateral margin. Orbit 

 nearly as wide as rostrum. Three enlarged and distant spines on 

 anterior margin. 



Description. — Carapace about three-fifths as long as broad, 

 antero-lateral and postero-lateral margins subequal; surface coarsely 

 punctate in elevated regions, smooth in depressions, a little granu- 

 lous along summit of branchial, cardiac, and posterior part of meso- 

 gastric. Margin of front feebly tridentate, not advanced beyond 

 antennular fossettes. Orbits wider than long and completeh^ filled 

 with large eyes. Antero-lateral margin obscurely toothed, the teeth 

 having denticulate margins. Lateral spine strong, acuminate, 

 directed either outward or somewhat backward, and slightly upward. 

 A small tubercle, sometimes pointed, on postero-lateral margin at 

 end of branchial ridge. Extremities of posterior margin either 

 angular or marked with a small tooth. Inner lobe of orbital floor 

 produced nearly to hne of front. Chehpeds narrow, lower surface 

 smooth, upper surface with a scant marginal fringe of hair. Arm 

 with upper surface convex and scabrous, anterior margin armed with 

 man}' small denticulated teeth, of wiiich three or four are noticeably 

 larger and sometimes spiniform; posterior margin evenly denticulate 

 and terminating in a spine. Outer margin of wrist denticulate, inner 

 margin granulate, a longitudinal Une of granules through middle of 

 upper surface. Hand with denticulate inner and outer margins, 

 with granules along outer margin of upper surface. Thumb not bent 

 down or in, prehensile edge mth three or four large teeth. Movable 

 finger spinulous on upper surface; a spine at terminal tliird directed 

 distally; prehensile edge finely toothed. Fingers of larger claw with 

 a small gape. Last three pairs of ambulatory legs reaching beyond 

 end of arm; first pair barely reaching dactylus of second. Legs almost 

 smooth; lower margins of meral joints very finely denticulate. The 



