404 BULLETIN OF THE BUREAU OF FISHERIES. 



Porcellana soriata Say. PI. xxix, fig. 6. 



PoTcellana soriata Say, iSiS, p. 456; Beaedict, 1901, p. 137. 



Pisidia soda Leach, 1S20, p. 54. 



Porcellana sociaia Gibbes, 1850, p. 190: Kingsley, 1S79, p. 407. 



Integument firm, areolations of carapace well marked, some of them tuberculate. Carapace hex- 

 agonal, slightly wider than long; margins more or less hairy; front, ^^ewed from above, rounded, triden- 

 tate from before, the rostrum little, if any, longer than tlie lateral teeth. Antennje slender, about as 

 long as carapace. 



Chelipeds long and heavy, very tuberculose; hand fringed with hair along lower margin and with 

 the tubercles in rather well-defined rows; fingers with white, strongly hooked tips; carpus with a strong 

 spine and with the tubercles irregularly arranged; under slight magnification the tubercles appear 

 granulate. Second, third, and fourth legs stout, hair>-, and with sharp, ciu-ved dactyli. Fifth legs ves- 

 tigial and placed above the others. Abdomen flattened, but of moderate width; telson subtriangular 

 and divided into five regions by well-defined fissures. 



Length of carapace, of a male 5 mm.; width, 5.25 mm. 



Color in life, a dirty gray; in alcohol, a rusty or grayish red. 



Several specimens of this little crab were collected early in the spring of 1912 and two more were 

 secured in July, 1913. In both instances the crabs were foimd in the canals of sponges washed up on the 

 outer beach of Bogue Bank near Fort Macon. In 1916 two pairs were collected by Mr. O. W. Hyman 

 from the Fort Macon jetty. At the fishing banks the species is common in the larger sponges that are 

 brought up in the dredge. On several occasions 25 or 30 specimens have been collected from one sponge. 



Genus PETROLISTHES Stimpson. 



Peirolisthes Stimpson. 1858, p. 240. 



Petrolisthes galathinus (Bosc). PI. xxix, fig. i. 



Porcellana galaihina Bosc, 1803, p. 233, pi. 6, fie. 2. 



Porcellana sexspinosa Gibbes, 1850. p. 190. 



Petrolisthes sexspinosus Stimpson. 1863, p. 73; Kingsley, 1879, p. 405; Benedict. 1901, p. 133. 



Petrolisthes galathinus Ortmann, 1897, p. 283. 



Carapace a little longer than wide and crossed by numerous ciliated, rugose lines which are best 

 defined anteriorly; front produced into a broad, triangular, sinuous-sided rostrum marked off from the 

 orbit by a notch ; supra-orbital and outer orbital spines strong and acute ; a strong postorbital spine from 

 which a ridge runs backward a little distance, forming the margin of the carapace, and then turns inward 

 to be lost among the rugae of the back. 



Antennae about two and a half times as long as the carapace. Merosof third maxilliped with a strong 

 internal spine. Chelipeds large, flattened, crossed obliquely by ciliated rugae and dentate and ciliate 

 along the outer margin of the hand and carpus; carpus about half as long as hand, its inner margin with 

 five or six strong, serrate spines; movable finger sinuate, its upper margin costate; meros with a spine 

 at the inner distal angle. First, second, and third walking legs with the meros flattened and denticulate 

 on the superior margin; dactyli spinulose. Fourth legs slender and carried on the back. 



Length of carapace, 8 mm.; width, 7.5 mm.; length of chela, 10.5 mm.; carpus, 6 mm. 



Color in life, grayish brown without markings; in alcohol, light brown with purple or dark-red lines 

 and dots on the rugse. 



Quite a number of specimens of this little crab were taken by the Fish Hawk at depths of 6 or - fathoms 

 off New River Inlet and off the mouth of the Cape Fear River. One or two of these individuals bore 

 rhizocephalan parasites. 



Genus PACHYCHELES Stimpson. 



Pachychcles Stimpson, 1858, p. 228. 



Pachycheles ruglmanus H. Milne-Edwards. PI. xxix, fig. 2. 



Pachycheles ruQimanus H. Milne-Edwards, iSSo, p. 36; Benedict. 1901, p. 136. 



Carapace slightly longer than wide, flat from side to side, convex from front to back, lightly rugose 

 along the sides; frontal margin projecting downward in an obtuse angle in the middle, hardly visible 

 from above; orbits deeply excavated, their margins slightly raised and their external angle spiniform. 



