130 U.S. NATIONAL MUSEUM BULLETIN 292 



stream, C. bocourti may be seen wandering about among the rocks, 

 struggling with one another over a bit of debris (viscera of a chicken, 

 small chunks of suet, or similar discarded refuse), or pressing close 

 to the bottom against a stone. The crabs were not observed after 

 dark; however, it would be surprising were they much more active 

 at night than during the day. 



A single specimen of this crab was found close to the shore in a 

 small pocket of water in the mud flat adjacent to the mouth of the 

 Indian River at Portsmouth, and large specimens were collected 

 near the mouth of the Salisbury River. In all three of these areas, 

 the water was dark, presumably somewhat stagnant; both the Mero 

 and SaUsbury Rivers are distinctly polluted, and none of the three 

 was in direct communication with the Caribbean when collections 

 were made. 



No intensive search was made in other streams on the island to 

 locate this crab, but many collections were made in the lower reaches 

 of the Layou both during the day and at night, and not one individual 

 was seen there, whereas a number of Callinectes sapidus were observed. 

 In sharp contrast to the Mero and SaUsbury Rivers, this stream is 

 always flowing and, although perhaps slightly poUuted, does not 

 have a debris-littered bed, and any materials in the nature of garbage 

 would be quickly washed to sea. Perhaps the relatively clean bed of 

 the stream is responsible for the apparent absence of this crab in it. 



Distribution. — Southern Florida to Estado de Santa Catarina, 

 Brazil (Jamaica, Puerto Rico, Saint Croix, Dominica). 



Dominica Stations: 36, 38, 112 (0-5 ft.) 



37. Callinectes danae Smith 



Figure 376 



Lwpa dicantha. — Dana, 1852, p. 272 [not Lupea dicantha H. Milne Edwards, 

 1834]. 



Callinectes diacanthus. — Ordway, 1863, p. 575. 



Callinectes Danae Smith, 1869b, p. 7 [type-localitios: Recife (Pernambuco), Sal- 

 vador (Bahia), and Rio de Janeiro, Brazil (restricted to Recife, Estado de 

 Pernambuco, Brazil by Rathbun, 1930)]. 



Callinectes danae. — Rathbun, 1930, p. 118, text-figs. 15d, 16b, 17b, 18d, pi. 51. — 

 Williams, 1966, p. 86, figs. 2, 4c, d. 



Diagnosis. — Carapace with central trapezoidal (metagastric) area 

 nearly half as long as anterior width; anterolateral margins rather 

 feebly arched; anterolateral teeth directed outward, not cur^dng 

 noticeably forward; lateral spine as much as three or four times as 

 long as posterior margin of preceding tooth. Submedian pair of frontal 

 teeth small but distinct. First pleopods of adult male nearly straight, 

 sometimes overlapping, reaching about to suture between somites 

 supporting third and fourth pereiopods; distal portion usually appear- 



