2756 Bulletin 4.7, United States National Museum. 



male or female (immature specimens) ; tail less than 2 and more than If 

 times length of the disk; dorsal fin smaller than that of freminvillei; teeth 

 in 7 series, much shorter and narrower than those of freminvillei, third row 

 about 2 and middle row about 4 times as wide as long. Body smooth. 

 Entire length 29 inches; snout to end of ventrals 11.5, vent to end of tail 

 18.5, and width of disk 17.5 inches. Olivaceous, darker on the center; 

 white below. The Museum of Comparative Zoology has a large specimen 

 which agrees well with this description. Compared with M. freminvillei, 

 this species has very small eyes, the pectoral below the orbit is wider than 

 the eyeball, and the fin in front of the skull is but little wider than at its 

 sides. In freminvillei the eyeball is twice as wide as the fin beneath it, 

 and the fin in front of the skull is much wider than below the eye. Com- 

 paring specimens of about the same size, of the same sex, of freminvillei, 

 californictis, and goodei, the latter is readily distinguished from the for- 

 mer two by the broad flange at the side of the head, the small eyes, the 

 small teeth, and the broader lateral angles, of the pectorals. Central 

 America. (Garman); probably on the Atlantic Coast. (Named for George 

 Brown Goode.) 



Myliobatis goodei, GARMAN, Proc. U. S. Nat. Mus. 1885, 39. Central America. (Types, Nos. 

 9524 male, and 9529 female.) 



Page 91. Family XXVIII should stand as Aodontidw, the name Man till m 

 being used for a family of Orihoptcra. 



Page 92. After Aodon hypostomus insert: 



58 (a). CERATOBATIS, Boulenger. 

 Ceratobatis, BOULENGER, Ann. Mag. Nat. Hist., ser. 6, vol. xx, August, 1897, 227 (robertsii) . 



Characters of Dicerobatis, Blainville, but the teeth restricted to the 

 upper jaw. (Kepds, horn; Bari$, ray.) 



138 (a). CERATOBATIS ROBERTSII, Boulenger. 



Band of teeth occupying only width of month, its width 10 times in 

 its length ; teeth tessellated, hexagonal, 2 to 3 times as broad as long, 

 rugose with numerous obtuse ridges ; mouth inferior, wide. Pupil verti- 

 cally elliptic. Body smooth ; pectoral fins with nearly straight, slightly 

 convex anterior and slightly concave posterior border ; cephalic fins meas- 

 uring a little less than width of mouth; spiracles behind the eyes; space 

 between last branchial clefts that between first; dorsal fin between the 

 ventrals; tail slender, without spine, nearly twice length of body. 



Millimeters. 



Length of disk, without cephalic appendages 350 



Width of disk 780 



Cephalic tin 90 



Width of mouth 105 



Diameter of eye 12 



Ventral fin ; 70 



Tail 620 



Black above, white beneath. Jamaica. One specimen known. This ray 

 grows to a very great size, but specimens are almost impossible to obtain, 



