236 CRABS OF THE FAMILY PERICERIDE—RATHBUN. 
Rept., Zoél., xvi, p. 72, 1886. Andrews, Trans. Conn. Acad., v1, pp. 99-121, 
pls. XXV-XXvIlI, 1883 (anatomy). R. Rathbun, Fishery Industries of United 
States, sec. 1, p. 778, pl. 269, fig. 4, 1884. Kendall, Bull. U. S. Fish Comm., Ix, 
p- 303, 1889 (1891). , 
LTibinia canaliculata. Say, op. cit., p. 77, pl. 1v, fig. 1. .Milne Edwards, op. cit., p. 
300; (Atlas Regne Anim. de Cuvier, Crust., pl. xxi, fig. 1). Gould, Invert. 
of Mass., p. 327, 1841. De Kay, op. cit., p. 2 (partim). White, loc. cit. Gibbes, 
Proc. Amer. Assoc. Ady. Sci., 3, p. 169, 1850. Streets, Proc. Acad. Nat. Sci. 
Phila., xx, p. 105, 1870. Coues, Proc. Acad. Nat. Sci. Phila., p. 120, 1871. 
Smith, Rept. U. S. Commzr. of Fisheries for 1871 and 1872 (1874), p. 548. A. Milne 
Edwards, op. cit., p. 128. Kingsley, op. cit., p. 316, 1878. 
Libinia afinis. Randall, Jour. Acad. Nat. Sci. Phila., vu, p. 106, 1839. Gibbes, op. 
cit., p. 170. Stimpson, Boston Jour. Nat. Hist., vi, p. 455, 1857. Streets, loc. 
cit. 
A variety from Charlotte Harbor, Florida, collected by the U.S. Fish 
Commission schooner Grampus, approaches somewhat the dubia type. 
It has the rostrum of emarginata, as well as the hepatic, the two intes- 
tinal, and the four median gastric spines; but the three branchial spines 
and those of the lateral margin, as well as some of the median spines, 
are long and strong as in dubia. 
One specimen from St. Augustine, Florida, has a rostrum with three 
spines instead of two, one median, the others regularly diverging on 
either side. 
Occasionally this species oceurs in such numbers on the oyster grounds 
of Long Island Sound, and so interferes with the operations of the steam 
oyster dredgers that work is abandoned until the crabs (which are known 
to the oystermen as “spiders”) have passed over. 
RECORD OF SPECIMENS EXAMINED. 
Massachusetts; U. S. Fish Commission: 
Wellfleet and Provincetown (2978) ; Provincetown (3898, 5875); Cape Cod (2025) ; 
south of Cape Cod, 27 fathoms (12852); east of Martha’s Vineyard, 3 to 7 fath- 
oms (9376); Vineyard Sound, shore to 9 fathoms; Wood’s Holl (6704); Me- 
nemsha Bight (6710); Buzzards Bay, 5} fathoms (4054); Mattapoisett Harbor 
(5825). 
Rhode Island; U. 8. Fish Commission: 
Narragansett Bay, shore to 15 fathoms. 
Connecticut; U. 8. Fish Commission: 
Noank (5874); New Haven (3843); Savin Rock (4102); oyster beds of H. C. Rowe, 
mouth of New Haven Harbor (3042); oyster grounds off Milford, Stratford, 
Bridgeport, and Norwalk (16023). 
Long Island: 
Fort Pond Bay, U. S. Fish Commission (14582); Fire Island beach, Dr. T. H. 
Bean (8916). 
Virginia; U.S. Fish Commission: 
Chesapeake Bay (5870); Hampton Roads, 11 to 12 fathoms (12452). 
North Carolina: 
Beaufort (Union College Coll.); Middle Sound, near Wilmington, U. 8. Fish 
Commission (3375). 
South Carolina; U. 8. Fish Commission: 
Bull Creek (16074); Charleston Harbor (3911); west end of Skull Creek (16075) ; 
Calibogue Sound (16073). 
