342 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Ocypode (cardisoma) conlata DE HAAN, Fauna Japon., Crust., 1835, p. 27. 



Not Cancer cordatus Linnaeus. 

 Ocypode ruricoln FREMINVILLE, Ann. Sci. Nat., ser. 2, Zool., vol. 3, 1835, p. 



217. Not Cancer rnricola Linnaeus. 

 Ocypoda gigantea FBEMINVILLE, Ann. Sci. Nat., ser. 2, Zool., vol. 3, 1835, 



p. 221. 

 Cardisoma guanlinrni MILNE EDWARDS, Ann. Sci. Nat., ser. 3, Zool., vol. 20, 



1853, p. 204 [170], pi. 9. 

 Cardisoma quadrata SAUSSURE, MCm. Soc. Pliys. Hist. Nat. Gen&ve, vol. 14, 



1858, p. 438 [22], pi. 2, fig. 13 (type-locality, Haiti; type in Geneva 



Mus.). 

 Cardisoma diurnum GILL, Ann. Lye. Nat. Hist. New York, vol. 7, 1859, 



p. 42 (type-localities, Barbados, Grenada, and St. Thomas; types not 



extant). 

 Cardisoma guanhumi SMITH, Trans. Connecticut Acad. Arts and Sci., vol. 2, 



1870, p. 143, pi. 5, fig. 3. 



Diagnosis. First abdominal appendages in male blunt at tip. 

 Legs sparsely hairy. 



Description. Carapace strongly convex fore and aft ; the posterior 

 gastric and the cardiaco-intestinal regions defined by grooves. 

 Antero-lateral border defined by a raised line, which becomes in- 

 distinct with age and is not continuous with the outer margin of the 

 orbital tooth, but starts at a small denticle behind that tooth. Sides 

 of front very oblique. The sinuous upper border of the orbit runs 

 very slightly backward to the base of the outer orbital tooth. The 

 greatest height of the orbit is a little more than half its length. The 

 basal joint of the antenna is large, touching the front. The breadth 

 of the bnccal cavern at its middle is about equal to its length in the 

 middle line. 



Chelipeds smooth except for a few small tubercles, wrinkles, den- 

 ticles or granules along the edges of some of the joints and tuber- 

 cles on the inner surface of palm and fingers ; inner angle of the wrist 

 dentiform, palm higher than its superior length, especially in the 

 larger hand; the stout fingers meet only at tip and are much more 

 gaping in the larger hand. 



The size of the larger cheliped varies with age. In adults of 

 moderate size it is about twice the length of the carapace, the ischium 

 hardly projects beyond the carapace, and the length of the dactylus is 

 about one and one-third times the height of the palm. In old speci- 

 mens, especially in the male, it is about three times the length of the 

 carapace, the ischium projects far beyond the carapace, and the length 

 of the dactylus is twice the height of the palm. 



Legs usually sparsely setose on the margins, though sometimes 

 eld specimens have conspicuous black bristles on the distal margin of 

 the merus joints and on the margins and surfaces of the carpal and 

 propodal joints with the exception of the posterior edge of the 

 former. 



