442 BULLETIN OK THE BUREAU OF FISHERIES. 



curved movable finger, the smaller one with a proportionately longer thumb and long, straight mov- 

 able finger; in neither hand is there a large basal tooth on the movable finger. Ambulatory legs long, 

 slender, compressed, and more or less hairy. 



Length of a male, 14.5 mm.; width, 18.5 mm. 



Color, in alcohol, yellowish or brownish, fingers white. In life the color is stated by Fowler to 

 be more or less dull brownish, paler below; chelipeds brownish above, paler below; fingers brownish, 

 not contrasted with rest of propodus. Ambulatory legs all brownish, paler below. 



This small crab, which has been collected ^ various places along the Atlantic coast from Long 

 Island Soiind to Florida, has, as yet, not been detected in the Beaufort region. It may be that condi- 

 tions here are xmfavorable for its existence, but it is far more probable that a careful search will bring 

 it to light. It does not appear to be abundant anywhere, but it has been found under a great variety 

 of conditions and has been recorded from fresh-water streams as well as from the brackish and salt 

 water. The description given above has been based on a series of specimens from Indian River, 

 Fla., in the United States National Museum. 



Family GONOPLACIDAE. 



Brachyrhyncha closely resembling the Xanthidae but having the body usually 

 square or squarish and the male openings sternal or, if coxal, passing along a groove in 

 the sternum. 



Forty-nine genera are now assigned to this family, only one of which is represented 

 within the Beaufort limits. 



Genus EURYPLAX Stimpson. 



Euryplax Stimpson, i860, p. 60. 



Euryplax nitida Stimpson. PI. xxxvi, fig. 8. 



Euryplax nilidus Stimpson, 1859, p. 60; Smith, 1870, p. 162. 



Euryplax nitida Stimpson, 1871, p. 150; Kingsley, 1880a, p. 399; Rathbun, 1901, p. 8. 



Carapace about two-thirds as long as wide, convex from front to back, less so from side to side, 

 surface smooth and shining; anterolateral margin short and armed with three stout teeth including 

 the outer orbital angle; front about half as broad as carapace, entire or very faintly notched in the 

 middle, deeply notched on each side above the antennse, orbits wide. 



Chelipeds stout; distal end of inner face of meros of male with a round or oval pit concealed by 

 a tuft of plumose hairs; carpus broad, inner margin with a sharp spine and below this a pilose patch. 

 Walking legs slender. Females with narrower carapace, no pit at the end of the meros and the chelipeds 

 more nearly equal. 



Length of a male, 6.5 mm.; width, 10.5 mm. 



Ivvo specimens were taken by the Fish Hawk at depths of 14}^ and 16 fathoms on the fishing 

 banks. Both are males and of small size. Another specimen in the laboratory, probably from the 

 same locality in 1902 or 1907, is a female of a larger size but badly broken. 



Family PINNOTHERIDAE. The commensal crabs. 



Small commensal Brachyrhyncha having the body more or less globose or quad- 

 rate, the carapace often more or less membranous, and the eyes and orbits very small. 



This family comprises 23 genera, of which 3 have representatives within the Beau- 

 fort limits. 



KEY TO THE GENERA OP THE BEAUFORT REGION. 



o. Dactyli of the walking legs simple, acute. 



b. Third walking leg little, if any, longer than the other legs. 



c. Carapace globose and more or less membranous; buccal mass subquadrangular Pinnotheres. 



cc. Carapace more flattened, oval, and rather firm; buccal mass subtriangular Parapinnixa. 



bb. Third walking leg longer and stronger than the others, often considerably so Pinnixa. 



aa. Dactyli of the first, second, and third walking legs bifurcate Dissodactylus. 



