34 



BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Porto Rico: San Juan Harbor; NW. angle Morro Castle f mile; 

 4f-5i fathoms; S. M.; temp. 25.2° C; Jan. 16, 1899; station 0054; 

 Fish Hawk; 2 males, 1 female (245G4). Mayaguez Harbor; Custom 

 House E. by S. \ S. 2\ miles; 12 fathoms; stky. M.; temp. 27° C; 

 Jan. 19, 1809; station COCO, Fish Hawk; 1 male (245G5). 



Curasao; Albatross; 1 female holotype (19974). 



Genus EURYPLAX Stimpson. 



Euryplax Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1859, p. GO; 

 type, E. nithJa Stimpson. 

 Carapace transverse, broad, hexagonal; antero-lateral margin very 

 short, dentate. Front nearly half as broad as the carapace. Ocular 



peduncles of moder- 

 ate length. Anten- 

 nal flagellum exclud- 

 ed from the orbit by 

 an internal suborbital 

 lobe which joins the 

 front. 



Chelipeds heavy, not 

 very unequal. 



Sternum partially 

 exposed in the sinus 

 of the abdomen be- 

 tween its second and 

 third segments. All 

 the segments of the 

 abdomen distinct. 

 First segment narrow and little developed; second segment widest, 

 covering the sternum. 



An American genus. Analogous species on opposite sides of the 

 continent: nitida (Atlantic); polita (Pacific). 



Fig. 11. — EuKTPi.Ax nitida, male (15012). a. Abdomen 



AND PART OF STKUNCM, X 3s *, b, OUTER MAXILLIPED, 

 DOTTED LINB MaRKI.NU MEDIAN AXIS, X 5^. 



KEY TO THE SPECIES OF THE GENUS EDRYPLAX. 



A\ Antero-lateral margins converging anteriorly nitida, p. 34. 



A*. Autero-lateral margins parallel polita, p. 36. 



EURTPLAX NITIDA Stimpson. 



Plate 7. 



Euryplax nitida Sttmpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1859, 

 p. CO (type-locality, Florida Keys; type not extant). — Rathbun, Bull. 

 U. S. Fish Conmi., vol. 20, for 1900, pt. 2, 1901, p. 8. 



DiagnoBis. — Antero-lateral margins converging anteriorly. Arm 

 of male with a deep pit. Fingers white at tips. 



