THE GEAPSOID CKABS OF AMEKICA. 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 (23i30), length of carapace 5, width of same 

 7 mm. 



Uahitat. — 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 Eio Grande do Sul, Brazil. 

 To a depth of 28 fathoms. 



Material examined. — 



West coast of Florida; lat. 20° 47' 30" K; long. 83° 25' 15" W.; 

 28 fathoms; fne. wh. S. bk. Sp. brk. Sh.; Mar. 18, 1885; station 2110, 

 Albatross; one female (23132). 



West coast of Florida; lat. 20° 33' 30" N.; long. 83° 15' 30" W.; 

 27 fathoms; fne. wh. S. bk. Sp.; Mar. 18, 1885; station 2111, 

 Albatross; one male (23133). 



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

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



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

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

 station G081, Fish Ilaioh; one male y. (24521), 



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

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

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



Sabanilla, Colombia; Mar. 10-22, 1881; Albatross; three females 

 (23131). 



DISSODACTYLUS B0RRADAILEI,» new speciea. 



Plate 27, figs. 5-8. 



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

 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 halfwaj' 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 ridge 



* Named for Dr. L. A. Borradaile, Selwyn College, Cambridt;e, Euglaud. 



