THE GRAPSOID CKABS OP AMEEICA. 121 



long as third ; third, fourth, fifth, and sixth nearly equal ; last more 

 than half as wide as sixth, very short-triangular. 



Variations. There is some variation in the width of carapace and 

 legs and in the amount of bifurcation of dactyls. 



Measurements. Male (23430), length of carapace 4.G, width of 

 same G.G mm. Female (23430), length of carapace 5, width of same 

 7 mm. 



Habitat. Clings to the outside of the thick keyhole urchin, En- 

 cope emarginata, and probably also of E. michelini, which replaces 

 emarginata in the area between the Gulf of Mexico and Florida Keys 

 and Yucatan. 



Range. From west coast of Florida to Rio Grande do Sul, Brazil. 

 To a depth of 28 fathoms. 



Material examined. 



West coast of Florida; lat. 26 47' 30" N.; long. 83 25' 15" TV.; 

 28 fathoms; fne. wh. S. bk. Sp. brk. Sh.; Mar. 18, 1885; station 2410, 

 Albatross; one female (23432). 



West coast of Florida; lat. 26 33' 30" N.; long. 83 15' 30" W.; 

 27 fathoms; fne. wh. S. bk. Sp.; Mar. 18, 1885; station 2411, 

 Albatross; one male (23433). 



Jamaica; on underside of sand-dollars buried in sand; Sept. 1, 

 1910; E. A. Andrews; one male, three females (41751). 



Off Vieques, Porto Rico; Cape San Juan Lighthouse NW. N. 

 14J miles; 11 fathoms; Co. S. Sh.; temp. 20.2 C.; Feb. 8, 1899; 

 station GOS4, Fish Hawk; one male y. (24524). 



Stann Creek, 38 miles S. of Belize, British Honduras ; attached to 

 lower surface of Encope emarginata; W. A. Stanton; 14 specimens 

 (23429) ; 20 specimens (1 male is holotype) (23430). 



Sabanilla, Colombia; Mar. 1G-22, 1884; Albatross; three females 

 (23431). 



DISSODACTYLUS BORRADAILEI, 1 new species. 



Plate 27, figs. 5-8. 



Type-locality. Miami, Florida; 30 fathoms; John B. Henderson; 

 1 female holotype (Cat. No. 49230, U.S.N.M.). 



Diagnosis. Carapace very convex; postero-lateral surface con- 

 cave. Dorsal ridges run from lateral angles halfway to median line. 

 Legs short, stout; secondary spine of dactyls minute and remote 

 from primary spine. Palp of outer maxilliped 3-jointed. 



Description. Near encopei. Carapace longer and narrower, and 

 even more convex fore and aft. The antero-lateral margin turns 

 at the lateral angles in almost a right angle to form a low riclire 



1 Named for Dr. L. A. Borradaile, Selwyn College, Cambridge, England. 



