////; MOUTH. 



801 



6. TVfM. The teeth of the Dog arc forty-two in number: twelve incisors, four 

 canines, nnd twenty-six molars. 



Tii. incisors, six in each side of ih,. jaws, arc more develop, d in the superior tli an 

 in the inferior maxilla, ami are divided, as in the llor>e. into pincers, intermediates, and 

 cni'-r inrir-ors; the last being much stronger than tin- preceding, and these again 

 stronger llian tlie pincers. 



" '1'lieir free pa it presents, in the virgin tooth, three tubercles: a middle, which is the 

 strongest, and two lateral; these, together, are not unlike a trefoil or the npp;-r part of a 

 fleur-de-lix, especially those in the upper jaw. On the internal face is remarked a table 

 or dope, somewhat resembling that of the Ox and Sheep, and separated from the root 

 by a very distinct border whose extremities mark the lateral lobes. This table is of no 

 advantage in ascertaining the age. 



The root, very developed, flattened on both sides, and separated from the free 



Fig. 166. 



Fig. 167. 



GENERAL AND LATERAL VIEW OF THE DOG'S TK1. HI. 



portion by a well-defined neck, is solidly encased in a deep alveolus. Its internal cavity 



promptly obliterated. 



When the tooth is submitted to wear, the middle lobe is the first to disappear; so 

 that it no longer resembles a trefoil (fig. 167\ 



I'he caducous incisors are much smaller and more pointed than the permanent 

 ones; yi-t, like them, they show lateral lobes. Attheperiol of their eruption these 

 teeth are ,-omewhat widely apart. 



"The fani's. or canine teeth, two in each 

 jaw, an- wry .-tr <\\^, elon^at. d organs, conical 

 in form, curved backwards and outwards, and 



! immediately afi-r the incisors. 

 "The up|H-r fan.'* are the thickest, and 

 have a small space between them and the corner 

 incisors, in which ihe inferior canines are 1< !_'' <!. 



- These teeth :ife decidlloU-. like tile incjxirs, 



and are di.-tingni.-hed from the replacing ones 

 by their bring thinner and more eluiiirated. 



"They are worn more or less quickly, ac- 

 cording to the kind of food the nnimal obtains 

 and are Mimetiin--.-. l.mk. n in lighting. 



"The molars are distributed in tli two 

 jaws, twelve being fixed in th" upp-r ami four- 

 Hi the lower. Nearly all of them are 

 terminated |,y -,>ia,'\\ liat acute lobes, proper for tearing animal food. The -trongest 

 in ta'-h jaw i.-. fur the up|>cr, Ihe lirst ba-k-molar or fourth in the row. and in tin; lower, 

 ' !'th. All in front oftiMM ale decidiiou.t." 



AN 1 1 i:m;: \ 11 \\ oi i in: INCI>.II:S v\i> 

 .\\isi n i in is \ vi AK-m.ii DOO. 



