THE GKAPSOID CRABS OF AMERICA. 119 



Color. Light, with scanty dark mottlings which persist in alcohol 

 and are then of a purplish color. 



Measurements. Male (40271), length of carapace 2.9, width of 

 same 3.5 mm. Female ovig. (40272), length of carapace 3.3, width 

 of same 4.5 mm. 



Habitat. Clings to the outside of key-hole urchin, Mellita quin- 

 quesperforata=M. testudinata, and the sand-dollar, Echinarachnius 

 parma. 



Range. From Vineyard Sound, Massachusetts, to Pensacola, 

 Florida. 



Material examined. 



Off Menemsha Bight, Marthas Vineyard. Massachusetts; 1 speci- 

 men (U. S. Fisheries Lab.. Woods Hole). 



Western part of Vineyard Sound, Massachusetts; 11 fathoms; 

 1908; F. B. Sumner; 1 specimen (U. S. Fisheries Lab., Woods Hole). 



Narragansett Bay, Rhode Island; Beaver Tail Light S. E. by S., 

 | mile; 8J fathoms; S. Sh.; Aug. 6, 1880; station 770. Fish Hawk; 

 2 males, 3 females, ovig. (40271). 



Narragansett Bay ; E. of Brentons Reef Lightship ; 8^-10 fathoms ; 

 S. brk. Sh.; Aug. 23, 1880; stations 816-818, Fish Hawk; 7 males, 

 10 females (8 ovig.) (40272). 



Beaufort, North Carolina: Union College Collection, No. 72c; 1 

 female ovig. (deposit, U.S.N.M., Cat. No. 42788). Union College 

 Collection, No. 57c; 1 female (deposit, U.S.N.M., Cat. No. 42789). 



Charleston, South Carolina; Feb. 8, 1852; L. Agassiz; 15 speci- 

 mens (5729, M. C. Z.). 



Pensacola, Florida ; on Mellita quinquesperforata; J. E. Benedict ; 

 20 specimens (1 male is holotype) (23434). 



DISSODACTTLUS ENCOPEI Rathbnn. 



Plate 27, figs. "1-4. 



Dissodactylus encopei RATHBUN, Bull. U. S. Fish Comm., vol. 20 for 1900. 

 pt. 2 (1901), p. 22, text-fig. 5 a-e (type-locality, Stann Creek, 38 miles 

 south of Belize, British Honduras; holotype, Cat. No. 23430, U.S.N.M.). 



Dlssodactylns criniMc-belia MOREIBA, Arch. Mus. Nac. Rio de Janeiro, vol. 

 11, 1901, p. 37. pi. 3 (type-locality. State of Rio Grande do Sul, on 

 Encope, sp., probably E. emarginata; type in Mus. Nnc. Rio de Janeiro). 



Diagnosis. Dorsal ridge short, oblique. Legs stout; dactyls 1-3 

 bifurcate for less than half their length. Sides of segments 3-6 of 

 male abdomen convex; last segment an equilateral triangle. Palp of 

 outer maxilliped 3-jointed. 



Description. Carapace very wide, about one and four-tenths as 

 wide as long, posterior width but little less than greatest width. 

 Dorsal surface nearly naked and polished, strongly convex fore and 



