JordciJi a7id Evertnann. — Fishes of North America. 89 



Aetobalis laHceps, Gill, Ann. Lye. Nat. Hist. N. Y. 1865, 137, locality unknown, received 

 from San Francisco. It has never been properly compared with A. narinari, and may 

 not be dift'erent. 



56. MYLIOBATIS, Dumeril. 

 (Eagle Rays.) 



f Cephaleiilherii.i, Rafinesque, Indice Ittiol. Sicil., 61, 1810, {macvlaliin, probably a deformed ray). 

 MijUohal'm, DrsiKRiL in Cuvier, Kegne Animal, Ed. 1, 11, 137, 1817, {aqiiila). 

 Jlnlorhiiws, tiiLL, Proc. Ac. Nat. Sci. Phila., 18C2, 331 {i'e.ijierliUo = californiriis). 



Disk broad, the outer angles acute. Cephalic fins forming a soft con- 

 vex appendage in front of snout. Jaws about equal. Median teeth very 

 broad, n\uch broader than long in the adult, proportionally narrower iu 

 the j^oung. Several series of narrower teeth on each side of the median 

 series; teeth changing considerably with age. Free edge of the nasal 

 valve not deeply emarginate. Tail very long and slender, with a small 

 dorsal fin, and one or more serrated spines. Skin smooth or nearly so. 

 Size large. In all warm seas. (fivXca^, gvindev; /3fi r<f, ray.) 



MyLionATis; 

 n. Ventral fitis moderate. 



b. Teeth of main row 4 to 6 times as broad as long ; skin smooth. fkkminvillei, 13,^. 

 HoLORiiiNi's, (6A0S, solid ; pip, snout): 



(Id. Ventral fins large ; rhomboid, broader than long. 



c. Teeth of main row 3 to 4 times as broad as long. California's, 134, 



Subgenus MYLIOBATIS. 



133. MYLIOBATIS FREMINVILLEI, Le Sueur. 



Disk broader than long ; the breadth equal to the length of the tail. 

 Ventral fins much uarrow^er than in C. californicus. Skin entirely smooth. 

 A blunt, whitish prominence over each eye. Muzzle prominent. Teeth 

 of the main row 4 to 6 times as broad as long; small teeth in 3 rows. 

 Reddish brown ; tail nearly black. Cape Cod to Brazil ; not uncommon. 

 (For Chretien Paulin de Fr^niinville, a French naturalist.) 



Mijliolmtisfrniiiui-mei, Le Sueur, .Tour. Ac Nat. Sci. Phila., iv, 111, 1824, Rhode Island. 

 MyUohatis hi.'<piiiosiix, Storer, Proc. Bost. Soc. Nat. Hist., i, 1841, 53, Massachusetts. 

 MiiliolKttinliisphwxiif, DuMi'uii,, Elasmobranches, 637, 1870. 

 MiiHohatU (tenia, Ayres, Proc. Bost. Soc. Nat. Hist., i, 65, 1841, Connecticut. 

 M;iliohiiliiifrniiinriUei, Jordan & Gilbert, Synopsis, 51, 1883. 



Subgenus HOLORHINUS, Gill. 



134. MYLIOBATIS CALIFORMCIS, Gill. 



(California Sting K.\y; Batfish.) 



Disk not quite twice as broad as long ; the wings anteriorly convex. 



posteriorly somewhat concave. Cephalic fin very blunt, nearly 4 times 



as broad as long. Tail nearly twice as long as the disk. Ventral 



large, broader than long. Lateral teeth in 3 to 5 series on each side ; 



median teeth only 3 to 4 times as broad as long, even in the adult. Skin 



wholly smooth. Color dusky brownish ; the young somewhat variegated. 



