:>o ..\TKir.rrmNs TO NORTH AMERICAN ICHTHYOLOGY iv. 



rays; inhabiting warm seas. Similar in habits to the Trygonidcu. 

 (Group Myliiilititinti (.Jiiutlier, viii, 483-495.) 



Muzzle <iii in-. 



ti. 1. -ill in :i sin- . MTV liroad ................. ......... AETOBATIS, 41. 



an. Tcelh in several scries, (In- middle scries very lirnad ......... MYLIOBATIS, 42. 



* Mii/xle eiiiar^inate ; eeplialie tins liclow the level of the disk; teeth in several 

 ea ..................................................... RIIIXOPTERA, 43. 



41. AETOBATIS Miiller & Ili-nle. 



Bishop Rays. 



(I'.lainville ; Miiller it Ileiile. Pla^iosiomen, 1837: type RHJH narinari Euphrnson.) 



General form of Myliobatis. Muzzle entire. Teeth flat, broad, form- 

 ing a single series corresponding to the middle series in iri/liobatis, there 

 being no small lateral teeth. Upper dental lamina straight, lower 

 curved, the latter projecting beyond the upper. Free border of the 

 nasal valve deeply emarginate. Skin smooth. Tropical seas, (alr^-, 

 ragle; ,r:'r, ray. 



<J6. A. linriliari (Euplirasen) Miiller it Henlc. 



Disk twice as broad as long, its anterior borders a little convex, pos- 

 terior roneave, outer angles pointed, (\-plialie tin about one-third 

 broadei- than lon.i;. Teeth of the lower jaw straight or more or less 

 angularly bent. Tail .". or 1 times len.^tli of disk. Brown, with small 

 round pale spots. (Dmnn'il.) Virginia, to theln<l : an Ocean; not very 

 common on our coast. 



nuriiiiirt Kiiphrasen. \'<-\. Ak. Nya. llandl. IT'.H), xi, 217: ^aia flagellum 



h, Selm. :;i;i; ( ', ii : 1 1 li. r. \ i i i . I'.i'.'; 1 hmieril Hist. Nat. 1'oiss. i, (M'j.) 



. ?IYL,IOBATIS C. Dun^ril. 



Knt/lr 



(Dam6ril in C i' i( i !' pie Animal, ii, ed. 1, 1:57, 1-'17 : type Ilnin nijiiila T.inna'iis.) 



l> L l>rM;id. the outer angles acute ; cephalic, lins forming a soft con- 

 vex appenda-e in iron I ot Hie snout : ja\\s about e<|iial ; median teetli 

 \er\ ln-M.id. mncli broader th in long in the adult, proporl ionally nar- 

 rower in tin- \oiiii-; se\-eral series of narrower teeth on each side of 

 the median sei ii , , , , d _.. of (he nasal valve not deeply emar.uinate. 

 Tail \er\ lo;i u ;iinl slender, \\ilh a small dorsal tin and one or more ser- 

 ralcd -pines. Skm smool h or nearly so. ^i/.e large. In all warm seas. 

 . -i ind.-i ; . 



