254 THE PLAGTOSTOMIA. 



margin, subcaudal rounded, not pointed. Scales on the young broad-based, with 

 slender hooked cusps of which the distal portion is subcorneal and the basal 

 section carinate. As in other species there are two keels in front and others at 

 the sides. Larger scales to tubercles appear on the back; a median series above 

 the vertebrae. On a specimen of more than thirteen inches the modification of 

 the scales below the tail and edges of the paired fins is comparatively slight. 



Rusty or reddish brown with numerous small spots of black, the larger sym- 

 metrically arranged, Plate 16, fig. 1. On a larger specimen the black spots are 

 larger as compared with the others and more distinct. 



California and Mexico. 



Rhina philippi, sp. nov. 



Snout broad, subtruncate. Nasal valves not fringed; cirri without lobes. 

 Spiracles nearly as far apart as the eyes. Fold along the side of the head wider 

 and convex opposite the corner of the mouth, not angled as in R. squatina, much 

 narrower backward. Teeth in fu rows, no median teeth on the symphysis. 

 Postorbital process of the skull widely separated from the top of the cranium in 

 front of the suborbital process of the pterygoquadrate, leaving the foramen open 

 toward the eye. Dorsals equal, anterior rather more pointed. Outer border 

 of the pectoral nearly straight, slightly convex; outer angle little more than a 

 right angle, inner angle very broadly rounded, inner margin broadly curved, 

 posterior border nearly straight, slightly concave. Anterior edges of ventrals 

 very convex, outer margin nearly straight. Caudal larger, and supracaudal 

 broader than on either R. squatina or R. californica; subcaudal less pointed than 

 that of the former and more truncate than that of the latter. Scales small, with 

 irregular broadened base and slender hooked cusp, conical toward the summit 

 and commonly bearing two keels in front and one to two or more at each side on 

 the basal section. Below fins and tail, and on larger specimens more of the lower 

 surfaces, the crowns are so modified, flattened, and smoothed as to appear imbri- 

 cate. A few larger scales at the eyes and spiracles. No median row of large 

 tubercles on the back. 



Named in honor of Doctor Rodulfo A. PhiUppi. 



The specimens described were secured at the Mexillones, by Captain W. H. 

 A. Putnam. 



