100 Bulletin Vanderiilt Marine Museum, Vol. V 



shallow teeth, the first three of which are wide and rounded, the 

 fourth outjutting, dentiform. The postlateral margins are convergent, 

 the posterior margin is thickened and emphasized by a nearly parallel 

 groove. The orbital margins are tumid and marked by four suture 

 lines, two superior and two inferior. The frontal margin is of moderate 

 width, bilobate, not advanced beyond the orbital. 



The antennulae are separated by a well defined septum and fold 

 transversely. The antennae have the basal article short and broad, 

 touching the front only at the inferior orbital angle ; the flagellum is 

 short and slender, situated in the hiatus, and about equal in length to 

 two-thirds of the orbital diameter. 



The external maxillipeds have the anterior margin of the merus a 

 little oblique; a longitudinal groove in both the ischial and meral 

 articles. The male abdomen is five jointed, the third to fifth articles 

 being fused. The female abdomen is broadly oval and seven-seg- 

 mented. 



The chelipeds are equal in both sexes and are equal to each other. 

 The merus trilobate, crested on the upper margin, with a rounded 

 distal tooth ; the carpus is rounded on the upper and outer surfaces and 

 deeply rugose, being channelled by three or four transverse and one 

 longitudinal groove, the outer surface with highly polished rounded 

 beadlike-rugosities, the upper lateral margin crested, the crest em- 

 phasized by a submarginal parallel groove. Both fingers are black, 

 the black on the propodal finger of the male extending conspicuously 

 back and upward on the palm on the outer surface and on the inner 

 surface of the palm to even greater extent, covering half or more than 

 half of the surface and extending to the upper margin, with a slight 

 band of the lighter body color along the anterior margin at the base of 

 the finger. The fingers each have a distinct longitudinal groove and 

 are curved, with rounded, hollowed tips. The propodal finger is armed 

 with a single large molar. 



The ambulatories are crested along the upper lateral margin, 

 ornamented on the outer surface with longitudinal grooving; the 

 dactyl strong, slender, furred, with sharp brown tips. 

 References: Cancer incomparahilis Seba, Thesaurus, vol. Ill, p. 48, 



pi. 19, fig. 18, 1758. 

 Cancer floridus Herbst, Naturg. Krabben und Krebse, Bd. I, pt. 2, p. 



132, p. 264, pi. 3, fig. 39, pi. 21, fig. 120, 1782. 

 Cancer aeneus Linne, Mus. Ludovicae Ulricae Reg. p. 451, 1764; Syst. 

 Nat. ed. 12, vol. I, pt. 2, p. 1048, 1767. 



