MANTIDA. — XVIIL. 23 
the middle series largest. Otherwise essentially as in Dasyatide. 
Genera 3, species 20, in the warm seas. 
a. Snout entire. 
b. Teeth very broad, in one series. . . . . . . . SToOAsopon, 24. 
Oe) Wecti am Seweral series: 6). wise (eh ok Sees AETOBATIS, 25. 
aa. Snout emarginate; teeth in several series. . . . . RHINOPTERA, 26. 
24. STOASODON Cantor. (Aetobatis Miiller & Henle.) 
(arod, arcade; ddovs, tooth.) 
34. 5. narinari (Euphrasen). BisHop Ray. Disk twice as 
broad as long. Tail very long, three or four times disk. Brown 
with many round yellowish spots. Warm seas, N. to Va. (Nari- 
nari, the Brazilian name.) 
25. AETOBATIS Blainville (1816). (Myliobatis Duméril, 1817.) 
(a:rds, eagle; Baris, ray.) 
35. A. freminvillii (Le Sueur), Eagite Ray. Skin smooth; 
color reddish brown. Cape Cod S. Scarce. (For Christian Pau- 
lin de Freminville, author of some papers on Plectognaths. ) 
26. RHINOPTERA Kuhl. 
36. R. bonasus (Mitchill). Cow-nosep Ray. Cephalic fin 
emarginate, and placed below level of pectorals, so that the snout 
appears four-lobed when viewed from the front. Skin nearly 
smooth. Cape Cod 8S. “He enters the bay and ranges very exten- 
sively the flats where the soft clam lives. These shell-fish he is 
supposed to devour, for a shoal of cow-noses root up the salt- 
water flats as completely as a drove of hogs would do.” (Mitchill.) 
(R. quadriloba Le Sueur.) (Lat., a buffalo.) 
Famity XVUI. MANTIDA. (Tue Sea Dervis.) 
Rays of immense size, similar to the Aefobatide, but with the 
cephalic fins forming long ear-like appendages, and with the teeth 
very small. Skin rough. Genera 2, species 7; among the largest 
of all fishes, found in warm seas. 
a. Teeth in lower jaw only; mouth terminal . . . . . . . Manta, Q7. 
27. MANTA Bancroft. 
(Manta, blanket, “a name used at the pearl fisheries of Panama, 
for an enormous fish much dreaded by the divers, whom it is said 
to devour, after enveloping them in its vast wings.”) 
37. M. birostris (Walbaum). Sea Devin. Manta. Disk 
not quite twice as broad as long; tail as long as disk. Brown; 
disk 12 feet long; its breadth about 20. Tropical seas, N. to 
Delaware Bay. (Lat. bis, two; rostrum, snout.) 
