THE SHORE FISHES OF PERU 



69 



,«•■: v«- 



FiGURE 14. — Urotrygon caudispinosus, new species. From the type, 188 mm. long, Inde- 

 pendencia Bay, Peru (U.S.N.M. No. 127790). Insert, diagram of outline of snout and 

 position of mouth and nostrils. 



UROTRYGON PERUANUS, new species 



Figure 15 



Disk broader than long, rather pointed anteriorly, its anterolateral 

 margins nearly straight and oblique, convex elsewhere, broadest 

 opposite about the third pair of gill slits, its width 1.65, 1.7 in total 

 length; its greatest length 1.85, 1.85; length anterior to axil of pectoral 

 2.05, 2.05; length anterior to vent 2.15, 2.15; length posterior to vent 

 1.9, 1.95; tail from axil of ventral to its tip shorter than greatest length 

 of disk fully by an eye's diameter, rather broad and depressed at base, 

 its depth about 1.5 times in its width, becoming rather compressed 

 distally, with a narrow dermal fold above and below posterior to 

 caudal spine, forming a pointed caudal fin, narrower than eye at broad- 

 est place, being provided distally with rudimentary rays, giving it a 

 featherlike appearance; caudal spine moderately slender, about as 

 long as snout, its posterior half with rather strongly serrate margins 



624264—45- 



