616 ORDER CHONDROPTERYGII. 



the species ; their tail extremely narrow and long, is 

 terminated in a point, and is armed, like that of Pas- 

 tinaca, with a strong spine, serrated on both sides, 

 and has above, towards its base, in front of the spine, 

 a small dorsal. Sometimes there are two or more 

 spines \ 



Some have the muzzle advanced and parabolic. 

 Rata aquila, L. (the sea-eagle) ; Duham. Part II. 

 sect. ix. pi. x. ; and the teeth, Juss. Ac. des Sc. 1721. 

 pi. xvii 2 . Is found in the Mediterranean and the 

 Ocean. It grows to a very large size. The plates 

 of the middle of its jaws are much broader than long, 

 in a single range. The laterals are pretty nearly in 

 a regular hexagon, in three ranges 3 . 



Others (the Rhinoptera, Kuhl.) have the muzzle 

 divided into two short lobes, under which are two 

 similar ones 4 . 



1 Seethe tail with five spines, Voyage de Freycin. Zool. xlii. f. 3. 

 ! N.B. The fig. of Bl. 81. is by no means that of the Aquila. It 

 is a pastinaca, to which a fin has been added in front of the spine. 



3 Add Myl. bovina, Geoff. Eg. Poiss. pi. xxvi. f. 1. R. nari- 

 nari, L. Marcg. 75., and under the name of aigle, Lacep. I. vi. 2., 

 and the teeth, Phil. Trans. Vol. XIX. No. 283. p. 673. Eel tcnkee, 

 Russ. I. 8. It is found in both hemispheres. R. jiagellum, Schn. 

 73. His R. Nieuhowii, Will. App. X. Mookarrah tenkee, Russ. VII. 

 does not differ from it, except in the spine having fallen. The 

 teeth are as in the Aquila. R. Jussieui, Cuv., with the middle 

 teeth broader than long, on three ranges. Juss. Ac. des Sc. 1721. 

 pi. iv. f. 12. 



4 Myliobatis marginata, Geoff. Eg. Poiss. pL xxv. f. 2. Rata 

 quadriloba, Lesueur, Ac. Sc. Nat. Philad. 



