TEETH OF ELSUE;: 



373 



1)C cited, besides tlic nasal teeth of the Lepidoshcn, fig. 251, e, 

 and the occipital alveolus of tlie Carp and Tencli, fig. 250, the 

 marginal alveoli of the prolonged, depressed, well ossified rostrum 

 of the Saw-fish (PHstls, fig. 65). In the I..ampreys, fig. 1.38, and 

 in Hcloxtuniiift (an osseous fish), most t>f tlie teeth are attaclied to 

 the lips. Lastly, it is peculiar to tlic class /-"/.sees, amongst A^crte- 

 hrates, to offer examples 



of teeth develo]>ed in the '-"^ 



median line of the mouth, 

 as in the pal.ite of the 

 JNIyxincs, fig. 248, «; 

 or crossing the symphy- 

 sis of the jaw, as in 

 KoUdanns, Hcjjiiiiius, and 

 jSL/Vwhah'x, fig. 2-49. 



Nor is the mode less 

 varied tlian the place of 

 attachment. Tlie teeth 

 of Lojiluns, Pieciliii., 

 Anabh-ps, are always 

 moveable. In most 

 fislies they are anchy- 

 losed to the jaws by con- 

 tinuous ossificatiou from 

 the base of the dental ^ - —- 



pulp. Sometimes we "- n.-akurr.u-r.,t-r,.h „..,„„,, „„„.,v»^„.o. r. 

 find, not tlic base, but 

 one side, of the tooth anc]i3'loscd to the al\e(jlar border of the 



\ 



y, 



i 



n 



25a 



J 



Kriiinii ,.r llic Jiiiv "]' llic-' raiTiil-ii.^li, slld^ilrj I lie ] in >s IVfS . ll dull i i Utlll. V. 



law ; and the teeth oppose each other by their sides instead 



