22. MYLIOBATIDiE. 
49 
of the tail, covered by an armature composed of a very great number 
of small bony tubercles. Along tlie median line an irregular series of 
tubercles with the base enlarged, almost quadrilateral, the i)oints directed 
backward ; a tubercle on the shoulder girdle on each side of the median 
line. Five papillm in the mouth. Jaws strongly arched. Very young, 
almost smooth. Uniform brown. {Dumeril.) Florida to Brazil. 
(licda iuhercuJata Lacepede, Hist. Poiss. ii, 108: Tryr/on tuberculata Dumdril, Elasmo- 
braucli. 605: Tnjfjon tuberculata Giiuther, viii, 480.) 
65. I>. ssatoiEitas (Le Sueur) Goode &, Bean. 
Disk oval-rhomboidal, scarcely longer than broad, the anterior bor- 
ders lightly concave, united by rounded angles to the posterior borders, 
which are longer and a little convex; snout projecting; tail twice as 
long as the body ; upper part of the head rough with small spines ; on 
the middle of the back a row of tubercles commencing behind the head 
and prolonged on the base of the tail ; o buccal papillae. ; two spines on 
each side of the shoulder girdle ; tail rough, with two short, low cutane- 
ous folds; mouth strongly arched. Color uniform yellowish brown. 
{Dumeril.) “ Distinguished from D. centrums by the shape of the disk, 
the shape of the caudal spine, and the wing-like membranes on the 
tail” {Goode in lit.). Perhaps ’.dentical with the preceding. 
{Trijgon Le Sueur, Journ. Ac. Nat. Sci. Pliila. 1824, iv, 109: Trygon sabina 
Dumeril, Hist. Nat. Poiss. i, 607 : Trygon tuberculata Giintlier, viii, 480, part.) 
Family XXII.— MYLIOBATID^. 
{The Eagle Bays.) 
Disk broad ; the pectora.1 fins not continued to the end of the snout, 
but ceasing on the sides of the head and reappearing in front of the 
snout as one or two fleshy protuberances (cephalic fins), which are suii- 
ported by fin rays. Tail very long and slender, whip-like, with a single 
dorsal fin near its root, behind which is usually a strong, retrorsely 
serrated spine. Kasai valves forming a rectangular flap, with the pos- 
terior margin free, attached by a frennm to the niiper jaw. Skull less 
depressed than usual among rays, its suuface raised so that the eyes and 
spiracles are lateral in position. Teeth hexangular, large, flat, tessel- 
lated, the middle ones usually broader than the others. Ovoviviparous. 
No difterentiated spines on the iiectorals in the males, the sexes being 
similar. Ventralsnot emarginate. Genera 3 ; species about 20. Large 
Bull. Kat. Mus. Ko. 10 4 
