90 Ratlibun — Synopsis of the American Sesarmse. 



D'. Upper surface rugose. 

 E. Hand very broad. suh-al<t Smith. 



E'. Hand elongate. crasslpes-f Cano. 



A''. Carapace without a tooth behind t!ie outer orljital tooth. 

 B. iManus witli two or more pectinated ridges on the upper surface. § 2 



Subgenus Parasesanna^ de Man. 

 B'. Planus without two or more pectinated i-idges on the upper surface. 

 Subgenus Holometopus Milne Edwards ^ subgenus 



Si'sarma de Man. 

 C. Sides of carapace converging rapidly posteriorly. 



rubript'S liathbun, new name = mulleri Miers.*^ 

 C^. Sides of carapace not converging rapidly posteriorly. 



D. Protogastric or supra-frontal lobes tuberculate or granulate. 

 E. Movable tinger extraordinarily enlarged along its proximal 



half beneduii Rathbun, new name = recta de Man.^ 



E'. Movable finger not extraordinarily enlarged along its prox- 

 imal half. 

 F. Outer surface of hand densely hairy at base of fingers. 



barbimaua'f Cano. 

 F'. Outer surface of hand not densely hairy at base of fingers. 

 G. Meri of ambulatory legs less than twice as long as 

 broad. 



recta ^ Randall = mulleril* A. Milne Edwards. 

 G''. Meri of ambulator}^ legs more than twice as long as 

 broad. 

 H. Front widening considerabh' toward the lower margin. 

 raiersu* Rathbun, new name = "■' angustipes f" Miers,* 

 1S81 = stimpsoiiii Miers, 1886,* not 1881. 

 H^. Front not widening considerably tow^ard the lower 

 margin. 

 J. Protogastric or supra-frontal lobes faintly granulate. 



cinerea Bosc. 

 J''. Protogastric or supra-frontal lobes rough with ruga? 

 or lines of granulations. 

 K. Front not more than 3j times as wide as high. 



occidenialis* Smith. 

 K^. Front more than 3> times as wide as high. 

 L. ^Margins of meri of ambulatory legs subparallel 

 for their distal half 



roberti^ Milne Edwards = americana* 



Pocock ^ bromeUarum* Rathbun. 



'Not represented in America. 



■■'Challenger Report, Zool. XVII, 270. pi. xxi, f. 3, ISSCi, Bahia. 

 ^ Notes Leyden Mus., XIV, 249, pi. X, f 4, 1892, Surinam. 

 * This species has not been sutficiently characterized and is described 

 below. 

 *Type examined by the writer, 

 t Not seen by the writer. 



I 



