MYLIOBATIS TENUICAUDATUS. 433 



Myliobatis tobijei. / 



Myliobatis aquila Schlegel, 1850, Jap. Pisces, p. 310, pi. 14i, 



Myliobatis tobijei Bleeker, 1857, Verb. Bat. gen., 26, p. 130; Jordan & Fowler, 1903, Proc. U. S. 



nat. mus., 26, p. 663. 

 Myliobatis cornuta Gunth., 1870, Cat. fishes Brit, mus., 8, p. 490. 



Disk less than twice as wide as long, outer angles blunt, rounded, less blunt 

 than those of M. calif ornicus; anterior margin slightly convex, posterior slightly 

 concave, margin behind the base of the pectoral convex, hind angle blunt. 

 Rostral fins produced, broad, blunt, narrow at the sides of the head. Tip of 

 snout little prominent. Teeth in median row four to five times as wide as long, 

 wider in the older individuals. Dorsal small, rounded above, origin about one 

 and one half times the length of the base behind the ends of the bases of the 

 ventrals. Ventrals short, broad, rounded on the angles and the hind margin. 

 Pectorals nearly as broad as long, not falciform. Skin smooth. Tail long. A 

 horn above the orbit of males. 



Color light brown; young with many spots of lighter or reddish, more 

 distinct backward; old specimens uniform. Lower surfaces whitish. 



Japan. 



Myliobatis tenuicaudatus. 



Myliobatis tenuicaudatus Hector, 1877, Trans. N. Z. inst., 9, p. 468, pi. 10; Waite, 1907, Rec. Canterb. 



mus., 1, p. 9. 

 Myliobatis australis Macleay, 1881, Proc. Linn. soc. N. S. W., 6, p. 380; McCoy, 1882, Zool. Vict., 7, 



pi. 63; Waite, 1899, Mem. Austr. mus., 4, p. 47; 1904, Mem. N. S. Wales nat. club, no. 2, p. 11. 



Width of disk less than twice the length; rostral fins continuous with the 

 pectorals, nearly as wide at the side of the head as in front. Tip of snout not 

 produced. Median teeth of lower jaw four times as wide as long, of upper jaw 

 six times, or more. Pectorals hardly as wide as long, outer extremities mo'ler- 

 ately sharp, anterior margin nearly straight, posterior concave. 



Ventrals short, broad, subtruncate, inner rays rather longer than outer. 

 Origin of dorsal nearly opposite the ends of the bases of the ventrals, about 

 two thirds of the fin behind their tips. A serrated spine behind the dorsal. 



The type measured nineteen inches from snout to vent and thirty-six inches 

 across the disk. 



Dark brown with blue bars; white beneath. In cases apparently the bars 

 are represented by spots, or are obsolete. 



If dissection proves there are no rays at the sides of the head, connecting the 



