50 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
Sting 1 -ays ; inhabiting warm seas. Similar in habits to the Trygonidoi. 
(Group Mylioiatina Giiutlier, viii, 488-495.) 
* Muzzle entire. 
a. Teeth in a single series, very broad 
aa. Teeth in several series, the middle series very broad. 
** Muzzle emargiuate; cephalic fins below the level of the disc 
series 
..Aetobatis, 41. 
.Myliobatis, 42. 
teeth in several 
Kiiixoptera, 43. 
41. —aetobatis Miiller & Henle. 
Bishop Bays. 
(BLainviUe; Mlillor & Henle, PUgiostomeii, 1837: type Baja iioi iiieri Enphrascn.) 
General form of MiiUobatis. Muzzle entire. Teeth flat, broad, form- 
in<r a single series corresponding to the middle series in iti/liobatis, there 
being no small lateral teeth. Upper dental lamina straight, lower 
cnrvld, the latter projecting beyond the upper. Free border of the 
nasal valve deeply emarginate. Skin smooth. Tropical seas, (.iroy, 
eagle; ray. 
66. A. iaa 5 ’iBaa.a’i (Enphrasen) Miiller & Henlo. 
Disk twice as broad as long, its anterior borders a little convex, pos- 
terior concave, outer angles pointed. Cephalic flu about one-third 
broader than long. Teeth of the lower Jaw straight or more or ess 
angularly bent. Tail 3 or 4 times length of disk. Brown, with sma 
round pale spots. (Duminl.) Virginia to the Indian Ocean ; not very 
common on our coast. ^ 
{Baia narinari Enphrasen, Vet. Ah. Wya. lia ■ 7^-2 n 
Bloch, Schii. 361; Gunther, viii, 492; Dumeril Hist. Nat. Poiss. 1, 64 .) 
42.— HIA'EIOBATIS C. Dnra6ril. 
Bagle Bays. 
(Dmndril in Cuvier Rogue Animal, ii, «1. 1, 137, 1817 : type Baia ayaila 
Disk broad, the outer angles acute ; cephalic fins forming a so 
vex appendage in front of the snout; jaws about equal; inedi.an teeth 
very broad, much broader than long in the adult, proportionally liar- 
rower in the young; several , series of narrower teeth on each side of 
the median series. Free edge*of the nasal valve not deeply emarginate. 
Tail very long and slender, with a small dorsal flu and one or more sei- 
rated spines. Skin smooth or nearly so. Size large. In all warm seas. 
{ixuBa 7 , a grinder ; Barig, ray.) 
