14 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



G^. Abdomen of male ±-shaped. Antero-external angle 

 of merus of third maxillipeds strongly produced 



outward Callinectes, p. 98. 



F^. Outer maxillipeds remarkably advanced, overreaching 

 the front margin of carapace; last two articles of 

 palp compressed and lamellate. Chelipeds of male 



extremely long and slender Lupella, p. 132. 



W. No longitudinal ridge on the palate. Superior fissures of 



orbit open, V-shaped Arenaeus, p. 134. 



D^. Movable portion of antenna excluded from orbit by a prolonga- 

 tion of its basal article. Antero-lateral teeth alternately 



large and small Cronius, p. 138. 



A^. Eye-stalks and orbits extremely long. Antero-lateral teeth 5 or 4. Front 



very narrow Subfamily Podophthalminae, p. 143. 



Euphylax, p. 143. 



Subfamily Carcinidinae (Carcininae Alcock) 



The legs have a tendency to be stout; all four pairs are similar, 

 although the last pair has a broader and flatter dactylus. Carapace 

 not very broad, antero-lateral borders cut into 4 or 5 teeth. Basal 

 article of antenna fixed, longer than broad, and longitudinal in position. 



Genus CARCINIDES Rathbun 



Carcinus Leach, Edin. Encycl., vol. 7, 1814, pp. 390 and 429; type, C. maenas 

 (Linnaeus). Preoccupied by Latreille, 1796, for a genus of Amphipoda. 



Carcinides Rathbun, Proc. Biol. Soc. Washington, vol. 11, 1897, p. 164; type, 

 C. maenas (Linnaeus). 



Carapace hexagonal, not broad, convex, regions well defined, no 

 transverse ridges. Front projecting beyond the inner supraorbital 

 angles, three lobed, between a fourth and a sixth as wide as the cara- 

 pace. Antero-lateral borders shorter than the postero-lateral, thin^ 

 oblique, arched, cut into five strong teeth, including the outer orbital 

 angle. Orbits with a notch in the upper and one in the concave lower 

 border, inner lower angle dentiform, not prominent. Antennules 

 transversely oblique. Basal joint of antenna slightly longer than 

 broad, fixed; the flagellum stands in the inner hiatus. Buccal cavern 

 square, a little longer than broad; external maxillipeds rather elongate, 

 especially the merus which projects beyond the edge of the endostome, 

 epistome diamond-shaped. The ridges that define the efferent bran- 

 chial canals do not approach the edge of the endostome. Chelipeds 

 massive, about as long as the first three pairs of legs, slightly unequal; 

 arm short, unarmed ; inner angle of wrist dentiform or spiniform; no 

 spines on hand, which is deep and not prismatic; fingers stout, a little 

 shorter than the length through the middle of the palm, not very 

 strongly toothed. Legs stoutish; the last pair has the merus elongate 

 and unarmed, carpus not dilated, propodite shortened and somewhat 

 broadened, dactylus acutely lanceolate. Third to fifth abdominal 

 terga fused. 



Contains only one species. 



