1885. J PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 41 



pai>illse on tlie floor of the luoutb. Tail one and a third times the 

 length of the disk — from snout to end of ventrals, with a long narrow 

 fold on the lower side — under and behind the spine, and a short but 

 prominent one on the top, just behind the tip of the spine. The pecto- 

 ral angles are nearly opposite the middle of the length of the disk. In 

 this specimen, a young male, the disk is without asperities. 



Entire length fourteen inches ; disk about six ; width seven and a half. 



Color, rather light reddish brown or olivaceous; tail encircled by 

 white rings, the broadest near the end. The species resembles D. Jcuhlii, 

 but lias a broader disk and no spots. 



IsTo. G529. Hong-Kong, China. 



This ray would be placed in the section Byiiolophus with I), sephen. 

 Excejiting the angular outline of the mouth and the larger teeth in the 

 angles of this outline in the upper jaw, there is little to separate this 

 from other Dasyhati. 



Urolophus nebulosus, sp. n. 



Disk subround, resembling that of U. lialleri^viit^ asperities about the 

 middle over the posterior portion of the abdominal cavity. Without a 

 median series of tubercles on back or tail. Three small papillae at the 

 bottom of the mouth. In shapes of body and caudal closely allied to 

 TJ. halleri. 



Entire length 12, snout to ends of ventrals 7.5, to ends of pectorals 7, 

 and width 7 inches. 



Clouded olivaceous above ; whitish below. 



ISTo. 7356 ; Colima, Mexico. 



A specimen of U. halleri measures in entire length 13, snout to ends 

 of ventrals 8.4, to ends of pectorals 7.4, and width 7.4 inches. 



Urolophus torpedinus, Desm. ; M. & H. 



Foetus, length 5 inches. The membranous flap from above the upper 

 posterior portion of the orbit forms a broad cover for the spiracle. It 

 is quite as large as the spiracle, rounded above and produced in an acute 

 angle extending behind the opening. The spiracular opening is an 

 elongate slot and the valve is well developed. 



Very light olivaceous freckled with brown. Posterior half of tail ob- 

 scurely ringed with brown and lighfer color. 



Specimen 8184. New Jersey. 



Urolophus fuse us, sp. n. 



Disk smooth, subquadrangular, hardly as broad as long, forming a 

 blunt angle in front, tip of snout prominent. The tail from the vent 

 equals the distance from the same i)oint to the anterior edge of the 

 nostril, expansions of fin medium, tip blunt, insertion of spine a little 

 anterior to the middle of the length from the vent. Ventrals medium. 

 Claspers short, stout. Eye small, orbit as long as spiracle, interorbital 

 space as wide as mouth, which is less than half the distance of the latter 



