424 BULLETIN OF THE BUREAU OF FISHERIES. 



by a row of beadlike granules which is broken toward the front by a single tubercle of larger size and 

 toward the back extends to a point nearly opposite the end of the posterior margin. Chelipeds sub- 

 cylindrical in the adult male, about one and a half times as long as the carapace; meros with many 

 large tubercles; carpus and hand nearly smooth except on margins; hand somewhat flattened and di- 

 lated; fingers weak. 



Color, grayish brown, with darker irregular spots or marmorations, the granules white or tinged 

 with red. 



This curious crab is occasionally found stranded at low tide on Bird Shoal, but is more often obtained 

 by dredging in the shallow waters of the region. It is nowhere abundant and so far as is known it is 

 about as likely to be met with in one place as in another. The piu-selike receptacle formed by the 

 enormously enlarged penultimate segment of the abdomen of the female may be foimd filled with eggs 

 at almost any time during the summer. 



Genus ILIACANTHA Stimpson. 



lliaamtha Stimpson, 18716, p. 155. 



KEY TO THE SPECIES OP THE BEAUFORT REGION. 



a. Fingers about half as long as palm of hand intermedia. 



aa. Fingers longer than palm of hand subglobosa. 



Diacantha intermedia Miers. PI. xxxn, fig. 3. 



Iliacaniha mlermedia Miers, 1886, p. 302, pi. XXVT. fig. 3, 3a. 



Carapace orbicular, with upturned and truncate frontal portion; three posterior spines, of which the 

 median is conical, slightly recurved at the tip, and placed at a higher level than the shorter, flattened, 

 triangular spines of the posterior margin; surface of carapace with very small, evenly scattered granules; 

 margins granulate; front deeply grooved above, broadly notched in front and with the spiniform angles 

 of the branchial channels extending beyond it. 



Chelipeds slender; the meros cylindrical and granulate, the granules much coarser proximally; 

 manus smooth, nearly as long as carapace, more or less club-shaped, somewhat inflated proximally, 

 but taperingrapidly to the very slender fingers, which are about one-half the length of the palm, incurved 

 at the tip and denticulate on the distal half of their opposable margins. 



Color, gray, without markings of any kind; in alcohol, fading to a pinkish white. 



Dimensions of a male: Length, 16 mm.; width, 12 mm.; chela, length, 13 mm.; fingers, 4 mm. 



Two specimens of this little crab were taken by the Fish Hawk at station D 7942 . In general appear- 

 ance it so closely resembles the young of Persephona punctata that its identity would be pretty certain 

 to escape unnoticed on a cursory examination. 



Diacantha subglobosa Stimpson. PI. xxxii, fig. 2. 



Iliacantha subcjldbosa Stimpson, 1871. p. 155. 



Very similar to /. intermedia, but with less coarsely granulate carapace, more rounded spines at the 

 sides of the posterior end of the carapace and much longer fingers; the latter exceed the palm in length 

 and are armed at regular intervals with relatively large teeth between which are numbers of much 

 smaller teeth. 



Length of a niale, 21 mm.; width, 16 mm.; chela, length, 22 mm; fingers, 13 mm. 



There is no record of the occurrence of this crab in the immediate vicinity of Beaufort, but it has been 

 taken at various points along the coast to the north and south of this locality and doubtless will be found 

 to occtu- here. 



Genus LITHADIA BeU. 



LUhadia Bell, 1855, p. 305. 



Lithadia cariosa Stimpson. PI. xxxii, fig. 6. 



IMhadia cariosa Stimpson, i860, p. 238; Kingsley, 1878-79, p. 335. 



Carapace convex, subpentagonal, its surface very imeven and covered everywhere, as are the other 

 parts of the body and legs, with beadlike granules, larger posteriorly ; front narrow, upturned, and broadly 

 notched; posterior margin bilobate and partly overhung by the large, knoblike cardiac lobe; subhepatic 



