THE CANCROID CRABS OF AMERICA 277 



outer angles of front rectangular, inconspicuous; edge thin and granu- 

 late. Superior margin of orbit spinulous, inferior margin armed with 

 slender spines; inner suborbital tooth prominent, subtriangular, edge 

 spinulous, sharp. Antero-lateral margin with four spines, bordered by 

 smaller spines or spinules; between the second and first or orbital tooth 

 is the greatest interval, below which is a subhepatic spine similar to, 

 but less produced than those of the margin. Lower surface of cara- 

 pace rough, similar to upper. 



Chelipeds hairy except on smooth portions. Arms granulate on outer 

 surface; margins armed with spines and spinules, those of upper surface 

 increasing in size distally . Wrist rough with sharp granules or spinules. 

 Upper and proximal half of outer surface of major palm covered with 

 stout spinules, which have a tendency to form longitudinal rows and 

 toward the lower and distal margins become smaller and granuliform. 

 Smaller palm roughened on entire outer surface with spinules or spini- 

 form granules; upper surface with two rows of spines; inner facegran- 

 ulous except near fingers; dactyli of both chelipeds a little roughened 

 near the base. Fingers of minor chela deeply grooved, of major chela 

 less so. Merus of legs armed on anterior margin with a row of slender 

 spines; posterior margin spinulous; carpus and propodus armed above,, 

 below, and anteriorly with a row of spines. Legs sparingly hairy. 



Variation. — In the largest (type) specimens the carapace is nearly 

 naked and rougher than in the smaller specimens ; the bare portion of 

 the outer surface of the major palm is more distal than inferior. In 

 the Galapagan specimens the carapace is clothed with hair, and the 

 bare portion on the major palm is almost wholly inferior and is set 

 ofi" by a longitudinal row of acute granules. 



Measurements.- — Male, holotype, entire length of carapace 8.8^ 

 width of same including spines 12.5, fronto-orbital width 8.2, width of 

 front 4 mm. 



Range. — From Cape St. Lucas, Lower California, Mexico, to Gala- 

 pagos Islands. 



Material examined.— Off Cape St. Lucas; lat. 22° 52' 00" N.; long. 

 109° 55' 00" W.; 31 fathoms; rky.; temperature 74.1° F.; station 

 2829, Alhatross; 2 males, 1 is holotype (21582). 



Tagus Cove, Albemarle Island, Galapagos Islands; 1899; Hopkins: 

 Stanford Galapagos Expedition: 12 fathoms; 1 male (25670), 1 male, 

 1 young female (Stanford LTniv.). Reef, north of Tagus Hill:. 

 March 16; 1 male (25669). 



Remarl's. — In this species the antero-lateral border is not prolonged 

 so distinctly to the buccal angle as in typical Medaeus. In this, 

 respect it is akin to M. reynaudii (Milne Edwards), formerly in Xantho, 

 but recently placed in Medaeus by Odhner.^^ In spinulifer the areo- 

 lation, shape of front and arrangement of lateral teeth conform to 

 Medaeus. 



3« Goteborg's K. Vet. Hand., Fjarde Foljden, vol. 29, No. 1, 1925, p. 81. 



