80 THE SHORE FISHES. 



DASYATIDAE. 



Urolophus halleri Cooper. 

 Proe. Cal. Acad. Sci., 1863, 3, p. 9.5. Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 1896, pt. 1, p. 80. 



A single example, a male, No. 3335, 12 inches long from Acapulco. 



Snout 5 disc; spinous portion of tail longer than snout to ventrals; about 

 eighteen retrorse barbs, these more widely separated than in U. aspidurus; eyes 

 about as large as spiracles; caudal blunt and rounded. 



Urolophus aspidurus Jordan & Gilbert. 



Bull. U. S. Fish Comm., ISSl, 1, p. .307. Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 1896, pt. 1, 

 p. 81. 



One specimen. No. 3137, llj inches long from Bay of Panama. 



Urolophus rogersi Jordan & Starks. 

 Proo. Cal. Acad. Sci., 1895, ser. 2, 5, p. 388. 



A single individual, No. 3376, lli inches long from Acapulco. Distance 

 from tip of snout to a line across back from posterior base of pectorals 1.22 in 

 width of disc; tail, measured from vent 1.17 in width of disc; distance from vent 

 to anterior insertion of caudal spine 2.5 in width of disc; distance from anterior 

 insertion of caudal spine 2.30 in width of disc; length of spine 1.33 in distance 

 from posterior edge of eye to tip of snout ; twelve retrorse barbs on side of caudal 

 spine; caudal rounded; tubercles with a stellate base; five enlarged tubercles 

 on median line of back in humeral region; three smaller ones near the base of 

 tail; scattered small prickles on the interorbital space, along side of back, 

 posterior margin of pectorals, tip of snout, becoming numerous on the tail; 

 upper lip fimbriated. 



CLUPEIDAE. 



Sardinella thrissina (Jordan & Gilbert). 



Jordan & Evermann, Bull. 47, U. S. Nat. Mus., 1896, pt. 1, p. 430. 

 Clupea thrissina Jord.\n & Gilbert, Proc. U. S. Nat. Mus., 1882, 6, p. 353. 



Twelve specimens, lit to 2| inches long from Acapulco. M. C. Z. 29430 

 (3 specimens). 



Four specimens if to Ig inches long from Toboguilla Island, October 28, 

 1904. 



In these individuals the edges of the scales are crenate, scales 17 + 12 or 13; 

 dorsal II, 15; anal II, 14 or 15. 



