THE SHORE FISHES OF PERU 61 



large dark blotches on inner parts of pectorals opposite widest portion 

 of disk; upper surface everywhere with distinct dark spots; lower 

 parts mostly pale ; posterior parts of disk slightly, though not abruptly, 

 dusky. 



The description is based on the type and only specimen at hand, a 

 female, 452 mm. long (U.S.N.M. No. 127787). This species is near 

 P. asper from which it differs, as indicated in the descriptions, in the 

 shape of the disk and in the teeth, narrower interorbital, in the abun- 

 dance and placement of spinules and spines, in the relative size of the 

 first and second dorsal fins, in the development of the rudimentary 

 caudal fin, in the development and shape of ventral fins, in color, and 

 in several other minor respects. 



The presence of many dark spots on the upper surface of the animal 

 suggested the name maculatus. 



Range. — The type, and only specimen known, was secured by the 

 Mission at Guafiape Island, on a line trawl in 10 fathoms. 



PSAMMOBATIS CHILCAE. new species 



Figure 12 



Disk only moderately broad, ^vdth tip of snout scarcely protruding, 

 convex opposite snout, and rather prominently concave opposite 

 spiracles, moderately to strongly convex elsewhere; wddth of disk 1.4 

 in total length; its greatest length 1.65; length anterior to axil of 

 pectoral 1.85; length anterior to vent 1.85; length posterior to vent 2.2; 

 tail strongly depressed, its depth 2.15 in its width at axil of ventral, 

 with a rather narrow cutaneous fold, beginning at axil of ventral and 

 extending to its tip; snout moderately long, 4.0 in length anterior to 

 axil of pectoral, and 5.35 in width of disk, its preoral length scarcely 

 less than its length anterior to eye, 4.3 in length anterior to axil of 

 pectoral, and 5.75 in width of disk; eye small, its longitudinal diameter 

 scarcely equal to width of spiracle, 4.7 in snout; interorbital broad, 

 concave, about 3.25 times diameter of eye, 1.8 in snout, 7.5 in length 

 anterior to vent; internarial space slightly narrower than mouth, 1.5 in 

 preoral length; mouth bent forward slightly in middle, its width 1.35 

 in preoral length, 7.7 in width of disk; teeth in 30 transverse rows, with 

 round crowns, surmounted by a rather large pointed central cusp; 

 prickles in a very broad band on lower surface along anterolateral 

 margin of disk ; a patch of prickles on upper surface at margin opposite 

 eyes and spiracles; none on snout, or elsewhere on upper surface of 

 body and tail; 11 bucklerlike spines on median line of tail, only the 

 last one, situated between dorsal fins, with a point; none on disk, 

 except spines toward the outer margins of pectorals, characteristic of 

 males, these in a band about as wide as eye at widest part; 2 dorsal 

 fins of about same size, separated by a distance about a third as long 

 as base of first dorsal; base of first dorsal 2.95 in snout; second dorsal 



