OXYSTOMATOUS AND ALLIED CRABS OF AMERICA ^35 



KEY TO THE SPECIES OF THE GENUS ILIACANTHA 



A'. No spine on subhepatic margin. 



B^ Fingers distinctly longer than palm. 



C Spines of posterior margin subtriangular, blunt subglobosa (p. 185) 



C^ Spines of posterior margin conical, acute. 



D^ Median spine twice as long as lateral. Chelipeds 2J4 



times as long as carapace liodactylus (p. 186) 



D^. Median spine one and one-half times as long as lateral. 



Chelipeds twice as long as carapace hancocki (p. 187) 



B^. Fingers subequal to palm in length intermedia (p. 186) 



A^. A short, blunt spine on subhepatic margin. 

 B'. Posterior margin between lateral spines invisible in dorsal 



view. Carapace with many large granules sparsa (p. 190) 



B^. Posterior margin between lateral spines visible in dorsal view. 



Carapace for the most part finely granulate schmitti (p. 192) 



analogous species on opposite sides of the continent 



Atlantic Pacific 



liodactylus. hancocki. 



sparsa. schmitti. 



ILIACANTHA SUBGLOBOSA Stimpson 



Plate 53, Figures 1, 2 



Iliacantha subglobosa Stimpson, Bull. Mus. Comp. Zool., vol. 2, p. 155, 1871 

 ^type localities, 3 stations in the Florida reefs, 40-80 fathoms; types not 

 extant). — Rathbun, Bull. Lab. Nat. Hist, State Univ. Iowa, vol. 4, p. 291, 

 1898; vol. 9, p. 67, 1921.— Hay and Shore, Bull. U. S. Bur. Fisheries, vol. 35 

 (1915-16), p. 424, pi. 32, fig. 2, 1918. 



Diagnosis. — Carapace finely granulate. Fingers longer than palm. 



Description. — Carapace siibglobose, smootlily and evenly convex, 

 and unarmed except at posterior extremity where there are three 

 spines, the middle one highest, longest, and curved upward and the 

 lateral ones flattened, subtriangular, blunt. Hepatic region consider- 

 ably swollen but entirely unarmed; bounded posteriorly by a depres- 

 sion indicating the outer extremity of the cervical suture, which is 

 entirely obsolete in its median portion. Intestinal region slightly 

 protuberant above the base of the spine. Margin of carapace 

 distinct and somewhat acute on the hepatic region and on the anterior 

 part of the branchial, as far as a slight angular projection, posterior 

 to which it ceases to be defined. Surface of carapace minutely 

 granulate. Chelipeds two and a half times as long as carapace, 

 excluding spine, and minutely granulate; merus more sharply 

 granulate than carpus and hand; fingers very slender, much longer 

 than the palm, and armed within wdth needlelike teeth. Ambulatory 

 legs very slender and smooth, those of first pair reaching to middle 

 of palm of the chelipeds; merus as long as the terminal three articles 

 taken together; dactyli deeply grooved and with two fringes of hair 



