Boone, Crustacea, Cruises of ''Eagle" and ''Ara," 1921-28 199 



Cancer rhomboides Herbst, Krabben u. Krebse, pi. I, fig. 12, pi. XLV, 

 fig. 5, 1792. 



Ocypoda rhomhoides Bosc, Hist. nat. des Crust., t. I, p. 198, 1802. 



Gonoplax rhomhoides Desmarest, Consid. gen. sur la cl. des Crust., 

 p. 125, pi. Ill, fig. 2, 1825. 



Subfamily : Prionoplacinae. 



Genus: SPEOCARCINTJS Stimpson. 



Speocarciaus carolinensis Stimpson. 



Plate 67. 



DiAGXosTic CHARACTERS: Carapace very convex longitudinally, al- 

 most subcylindrical, nearly flat transversely, front about one-third 

 of total width, weakly incised in median line ; anterolateral margin 

 with five teeth, including the postorbital, which is fused with the 

 adjacent tooth, forming a wide truncated tooth, the remaining teeth 

 are triangulate, separated from each other by wide U-shaped sinuses. 

 Chelipeds nearly equal, those of male much larger than those of 

 female, palms high, fingers long, deflected. 



Type : Prof. Stimpson 's type, which is no longer extant, came from 

 Charleston Harbor, S. C, found in subterranean galleries excavated 

 in mud at low water mark, presumably by other crustaceans or by 

 large worms. 



Distribution : South Carolina at Charleston southward to the "West 

 Indies. 



Material examined : One male from Nipe Bay, tag 125, and one 

 female dredged in 5 fathoms, south coast of Cuba, Feb. 15, 1924, tag 

 208, by the ''Ara," William K. Vanderbilt, commanding, establishes 

 the first Cuban record for the species. Three males and one female 

 caught in Limon Bay, Panama, February 26, 1926, by the ''Ara/' 



Technical description : Carapace very convex longitudinally, al- 

 most subcylindrical, nearly flat, transversely; frontal region equal to 

 nearly one-third the width of the carapace, relatively straight, very 

 weakly incised in the median line, the anterolateral margin is slightly 

 rounded, armed with five teeth, including the postorbital; the first 

 tooth is wide and shallow, united with the postorbital ; the second tooth 

 is broadly rounded but deeply incised; the third tooth is the longest 



