N.C. (Pearse and Williams, 1951). Individuals 

 are often so covered with sponge that they are 

 difficult to recognize. Gray (1961) reported the 

 species from Chaetopterus tubes. Low water to 28 

 fathoms. 



Type locality. — Charleston Harbor, off White 

 Point Battery, S.C. 



Known range.- — Buzzards Bay and Vineyard 

 Sound, Mass., to west coast of Florida; Cuba, 

 Puerto Rico, and St. Thomas, West Indies. 



Remarks. — Ovigerous females are known from 

 February to July in Florida, through the summer 

 in the Carolinas, and in Massachusetts in July 

 (Rathbun, 1925; U.S. National Museum records). 



Genus Nibilia Milne Edwards, 1878 



Rathbun, 1925, p. 289. 

 Nibilia antilocapra (Stimpson) 



Figures 230, 233F 



Pisa antilocapra Stimpson, 1871a, p. 110. 



Nibilia antilocapra: Rathbun, 1925, p. 290, text-fig. 97, pis. 102, 

 103, and 239 (rev.). 



Recognition characters. — Carapace pyriform, 

 conspicuously spinose, much swollen, longer than 

 wide; gastric and cardiac regions with about 18 

 spines of moderate size and smaller ones inter- 

 spersed, largest spines surmounting summit of 

 regions and somewhat surrounded by circle of 

 smaller spines; other regions also well spined. 



Figure 230. — Nibilia antilocapra (Stimpson). Male in 

 dorsal view, legs of left side not shown, 10 mm. 

 indicated. 



Rostrum horizontal, undivided at base but mod- 

 erately bifurcate for greater part of length, horns 

 varying from three-fifths to four-fifths total 

 length of rostrum. Preorbital spine ascending, 

 slightly curved, not so advanced as base of horns; 

 behind this a small spine on supraocular eave and 

 a triangular (intercalated) spine or tooth on su- 

 praocular border ; postocular cup terminating in a 

 spine. Basal antennal article with a short spine 

 just outside posterior end, behind this a tubercle 

 in line with prominent spine at angle of buccal 

 cavity. Maxilliped and sternum smooth. 



Chelipeds of adult male longer and stouter than 

 walking legs ; merus and carpus rough with spines 

 above and below; chelae almost cylindrical; hand 

 nearly as long as merus, nearly smooth, a few 

 spines near articulation with carpus; fingers 

 agape for half of length in old males, with a well- 

 developed tooth on dactyl in gaping part. Walk- 

 ing legs long, slender; merus and carpus with a 

 few spines longitudinally arranged ; dactyls long, 

 stout, unarmed. 



Measurements. — Carapace: large male, length, 

 120 mm., width, 82 mm.; female, approximate 

 length, 60 mm., width, 43 mm. 



Variations. — The young and half-grown are 

 covered with short hair, but the old are nearly 

 bare except for hairy dactyls on the walking legs. 

 Habitat. — The species has been reported from 

 gray and coarse sand, broken-shell, and coral bot- 

 toms (Rathbun, 1925) ; 39 to 140 fathoms. 



Type localities. — Florida, off Carysfort Reef, 

 52 and 60 fathoms; and off Alligator Reef, 118 

 fathoms. 



Known range. — Off Cape Hatteras, N.C, to 

 Gulf of Mexico just east of Mississippi River 

 Delta and Gulf of Campeche; Windward Islands, 

 West Indies. 



Remarks. — Ovigerous females have been re- 

 ported from St. Vincent in February and from 

 Barbados in March (Rathbun, 1925). 



Genus Libinia Leach, 1815 



Garth, 1958, p. 322. 



KEY TO SPECIES IN THE CAROLINAS 



a. Median line of carapace with about nine spines 



cmarginata (p. 252). 

 aa. Median line of carapace with about six spines 



ditbia (p. 252). 



MARINE DECAPOD CRUSTACEANS OF THE CAROLINAS 



251 



