34 



BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Porto Kico : San Juan Harbor ; NW. angle Morro Castle | mile ; 



-5 fathoms; S. M.; temp. 25.2 C.; Jan. 16, 1899; station 6054; 

 Fish Hawk; 2 males, 1 female (24564). Mayaguez Harbor; Custom 

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

 Jan. 19, 1899; station 6060, Fish Hawk; 1 male (24565). 



Curasao; Albatross; 1 female holotype (19974). 



Genus EURYPLAX Stimpson. 



Euryplax STIMPSON, Ann. Lye. Nat. Hist. New York, vol. 7, 1859, p. 60; 



type, E. nitida, 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- 



a & 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). 



KEY TO THE SPECIES OF THE GENUS EURYPLAX. 



A 1 . Antero-lateral margins converging anteriorly nitida, p. 34. 



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



EURTPLAX NITIDA Stimpson. 



Plate 7. 



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

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

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



Diagnosis. Antero-lateral margins converging anteriorly. Arm 

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



FIG. 11. EURYPLAX NITIDA, MALE (15012). n, ABDOMEN 



AND PART OF STERNUM, X 3j ; 6, OUTER MAXILLIPEL), 

 DOTTED LINE MARKING MEDIAN AXIS, X 5i. 



