60 



BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



slightly, 1.4 in preoral length, and 9.5 in width of disk; teeth in 34 

 transverse rows, with an oblong crown, and a rather low, transversely 

 broad cusp, becoming pointed at tip; prickles in a moderately narrow 

 band on lower surface along anterolateral margins of disk, extending 

 back somewhat beyond posterior rim of spiracles; a few prickles on 

 interorbital, and laterally from eye and spiracle, but none on snout 

 or nape; beginning again in nuchal region on back and extending 

 backward on tail; 2 low bucklers on orbital ridge, one in front of eye 

 and one behind it; 6 moderately prominent spines in a median series 

 in nuchal region, followed by very small ones, increasing gradually in 



Figure 11. — Psavimobatis maculatus, new species. From the type, 452 mm. long, Guanape 

 Island, Peru (U.S.N.M. No. 127787). Insert, ventral view of head. 



size from near base of ventral to the last one on tail, the last being 

 situated between the dorsal fins; a patch of moderately stout spines on 

 pectorals near inner posterior border; two dorsal fins, separated by a 

 distance a little less than a third the length of the base of first fin; 

 base of first dorsal 2.65 in snout; second dorsal scarcely larger than the 

 first, partly separated by a notch from the moderately well developed 

 rudimentary caudal; the latter extending fully to end of tail; ventral 

 with a rather shallow notch, the outer lobe moderately thickened, 

 4.55 in length anterior to axil of pectoral, and 6.3 in width of disk. 



Color gray, not especially paler toward margins of disk; a rather 

 small pale area on end of snout, followed by a dark blotch; a pair of 



