////: 



m 



(and also because they appear while the animal is yet sticking) ; the second, 

 comprising the latter, aro named /vy-Afc///*/ /*/// i // iiijilnriiiiti-s >, with new, 

 non-deciduous teeth which are not replaced, and are therefore named 

 ''/// teeth. (The r*yJ<n-/V/ and pergixtfut f><-th aro generally included 

 by us in the term pfnnuin-nf.) 



B. TKETH OF SOLIPEDS. The dentition of adult Solipeds is composed 

 of from 3G to 40 teeth, thus distributed in each jaw: male, 6 incisors, 2 

 canines. 1 -J molars; female, 6 incisors, 12 molars. With regard to the 

 tii>t dentition, it comprises the incisors and three anterior molars only, the 

 canine teeth and the three posterior molars being persistent. 



The latter teeth those of the second dentition offer in their develop- 

 ment a common, but very remarkable character, rarely met with in the other 

 animals. They are thrust up from the alveoli during the entire life of 

 the animal, to replace the surfaces worn off by friction ; so that the crown 

 is formed successively by the various portions of the fang, each of which 

 issues in its turn from the alveolar cavity. 



INCISORS. These are so named because they serve, particularly in the 



oi mi ixxi.i: ("Kims or TIIK KKXTIXK ANI> OK 1111. >ri:i 

 OF Tin: rri.r or AN IM-ISOI: loom. 



'rtion in which ral'itii-:itii'ii i< < j'lete, showing separate globular masses at 



the lino of junction with the un<-alcitif<i Miti>t;iin c, >< : at r :u-e seen oval nruuMS 

 of germinal matter (Us), with formed material on tlirir outer Mirfai : /. 

 Terminal ]K>rtions of IHT-.. ulir. <. 



Herbivora, for the incision (incido, to cut) of the food. They are arranged 

 in tin- M'rm< 'lit of a circle, at the extremity of the jaw, and are distinguished 

 by the names of pincer, intermediate or /!/// (//<//.// //), and <'///./ 

 t'--tli. Tin- II'IIH-II-* :in; the two middle teeth, the '/// ///("//"/'. th<- next, 

 and the <<./// -/-x uccujty tin- i-xtn-mitirs of the incisive semicircle. 



'I'll, general form of these teeth is that of a trifacial pyramid, presenting 

 an incinv. iti. .M \\lio.~. ^c.Micuvity is towards tlm mouth. The l>a>r of this 

 pyramid, formed by the crown, is flattened before and l>-hind ; the 

 summit, or extrcmity^of the fang, is, on the contrary, d. -press* d on lx)th 

 sides; the shaft of the pyramid offers, at different points of its height, a 



I of intermediate conformations which are utilised as ehai 

 of age. the n.iitinuiil j-u>liin ; _' outwards of the teeth bringing each of them 

 in siieei -..sit. n to the fi ictional surface of the crown (Fig, 151>, 1). 



.lined in a young tooth which has complete.! its evolution, the free 

 e\liil,it>: :l i,' anterior face, indente<l by a slight loii^itu.iinal ^: 

 which is prolonged to tla root ; a p< >teriir face, round-d from side to fide; 



