448 



THE PLAGOISTOMIA. 



Rhinoptera jayakari. 



Rhinoptera jayakari Boulengkr, 1895, Ann. mag. nat. hist., ser. 6, 15, p. 141. 



Width of the disk one and three fourths times its length. Head as broad 

 as long; snout emarginate. Tail two fifths of the total length. Teeth in nine 

 rows; those in the median row of the upper jaw eight times as broad as long, 

 nearly twice the width of those in the next rows. In those of the median row 

 of the lower jaw the width equals six times the length and is one and one half 

 times the width of those in the next row at each side. Total length 740, length 

 of disk 450, and width of disk 750 mm. 



Blackish above; whitish beneath. 



Muscat. 



Rhinoptera peli, 



Rhinoptera peli Bleeker, 18G2, Nat. verh. Holl. maatsch. wetens., 1. c, p. 18, pi. 1; Dumeril, 1865, 

 Elasm., p. 647. 



Teeth in nine rows, hexagonal, those in middle row three times as wide as 

 long; two rows of the outer teeth in the lower jaw and three rows of those in the 

 upper jaw as broad as long. Dorsal origin hardly behind the ends of the ventral 

 bases, end of fin slightly behind the ends of the ventral fins. Tail more than 

 twice the length of the body. Skin smooth. 



West Africa. 



Rhinoptera polyodon. 



Rhinoptera polyodon Gunth., 1870, Cat. fishes Brit, mus., 8, p. 495, fig. 



Fifteen rows of hexangular teeth in the upper jaw, those in the five middle 

 rows little broader than the outer ones. Lower teeth in nineteen rows, the 

 median row and the outer one on each side nearly twice as broad as the others. 

 Originally described from a pair of jaws of unknown origin. 



• 



Rhinoptera encenadae. 



Rhinoptera encenadae Smith, 1886, Proc. U. S. nat. mus., 9, p. 220; Jord. & Everm., 1896, Bull. 47, 

 U. S. nat. mus., p. 91. 



Named from an abnormal lower jaw, with fourteen rows of teeth unlike 

 on the two sides, from Todos Santos Bay, Lower California. 



Mobulidae. 



Head, body, and pectorals forming a subrhomboid disk, broader than long, 

 in which the head is broad and flat and bears a cephalic fin, a separated section 



