430 THE PLAGIOSTOMIA. 



longest in the base, origin one length from the ends of the bases of the ventrals. 

 A serrated spine behind the dorsal. Tail more than twice the length of the body. 



Snout to vent 65, vent to end of tail 15?, and width llg inches in the speci- 

 men of which the teeth are shown Plate 49, fig. 4. 



Back dark brown, bronzed or greenish; lower surfaces white, darker toward 

 outer ends. 



California. 



Myliobatis peruvianus, sp. liny. 

 Plate 36, fig. 4-6; Plate 55, fig. 8; Plate 73, fig. 2. 



Width of disk less than twice the distance from snout to vent; anterior 

 margins nearly straight, posterior concave; outer angles rounded, blunt. Skull 

 broader forward, subtruncate; fontanel broad in front, tapering to a point 

 backward. Rostral fins narrower forward, meeting the pectorals at a point 

 opposite the angles of the mouth in rays the length of which is hardly equal 

 to the width of the eye. Teeth in the median row about four times as broad as 

 long, Plate 36, fig. 6. Dorsal small rounded on upper margins, longest on the 

 base, origin behind the ends of the ventrals, or two lengths of the base behind the 

 bases of the ventrals. A serrated spine. 



Philippi, 1892, An. Mus. nac. Zool., 1, Chile, p. 6, Plate 3, fig. 1, described 

 Myliobatis chilensis from an abnormal specimen of four feet and a half in width. 

 Neither description nor figure give data by which its place in the system can 

 be determined ; it had twelve rows of teeth, of which the outermost row at each 

 side was wider, the fifth was widest and the others were of varying widths, the 

 connection between the pectorals and the rostrals was very broad, the outer 

 angles of the disk were very sharp, and the tail was shorter than the body. 

 The dentition, the angles of the disk, and the comparative length of the tail are 

 peculiar; the snout resembles that of M. goodei, in the width of the pectoral 

 along the side of head, more than that of any other of the known species. 



Myliobatis goodei. 



Myliobatis goodei Gasman, 1885, Proc. U. S. nat. mus., 8, p. 39; Jord. & Everm., 1S98, Bull. 47, U. S. 

 nat. mus., p. 2755. 



Disk less than twice as broad as long, outer angles rather widely rounded, 

 anterior border very little convex, hinder concave in its outer half, convex in the 

 inner, posterior angle blunt. Head of little prominence; fontanel broad on the 



