GILBERT AND STAKES — FISHES OF PANAMA BAY 15 



i6. Zapteryx xyster {Jordan & Evermann). 



Known only from the type specimens, collected by Prof. F. H. Bradley at 

 Panama, in 1866. 



Family RAJID.E. 



17. Raja equatorialis {Jordan d- Bollman). 



Known only from the type, which was dredged by the "Albatross" in 1888, 

 at Station 2797, in the Bay of Panama, at a depth of thirty-three fathoms. 



Family NARCOBATID^. 



18. Narcine entemedor {Jordait d- Starks). 



Not rai*e at Panama; five sj^ecimens seen in the market. Obtained also by 

 Dr. Gilbert at Panama, in 1883. 



The interorbital width is less than given in the original description. The 

 least width of frontal cartilage between the eyes is contained three times in the 

 preocular portion of snout; the distance between the eyes 1|. The longitudinal 

 diameter of the eyeballs, which somewhat protrude, equals or slightly exceeds the 

 diameter of the spiracle. The spiracle is horseshoe-shaped, the eye entering its 

 anterior border; everywhere except in front it is surrounded by a raised border 

 which bears a single series of small tubercles. Series of pores are conspicuous on 

 upper surface of snout, each pore often surrounded by a dark ring; a pair of much 

 larger pores near middle line behind spiracles. 



A deep fold of integument surrounds the lower jaw posteriorly, growing very 

 low as it surrounds angle of mouth, and passing anteriorly to join the base of the 

 frenum of the nasal valve. Laterally it is concealed by a still deeper fold, which 

 overlaps it postero-laterally and is continuous anteriorly with the inferior nasal valve. 



19. Discopyge ommata {Jordan <& Gilbert). 



Not seen by the expedition. First taken by Dr. Gilbert at Panama, in 1882. 

 The type is from "Albatross" Station 2795, in the Bay of Panama, at a depth of 

 thirty-three fathoms. 



Family DASYATID^. 



20. Urolophus halleri {Cooper). 



Not seen in 1896, but reported on previous occasions. U. umbriftr Jordan 

 and Starks is one of the many color forms of this species. U. nebulosus has been 

 ascribed to Panama (Jordan & Evermann, 1896, p. 81), but no authentic record of 

 its occurrence can be found. 



