chap, ix.] TEETH : TJNGULATA. 245 



352. Ass : ( $ some 20 yrs. old) on right side in upper jaw were two 

 canines, one in front of the other in the same alveolus. Morot, Rec. med. 

 vet., 1889, Ser. 6, vn. p. 480. Another somewhat similar case, ibid. 



353. Cow : in j}lace of right p, two third incisors placed side by side. 

 Morot, Bull, et mem. Soc. med. vet., 1886, p. 321. 



Goat, 4 — 5 weeks old ; supernumerary lower incisor placed be- 

 tween the two median incisors which rose above it. This tooth stood 

 transversely so that its edge lay exactly in the long axis of the head. 

 Morot, /. c. 



354. Sheep : extra incisor on left side. (Alfort Mus.). Goubaux, Rec. med. 

 vet., 1854, Ser. 4, I. [Several other cases.] 



Abnormal form of Canines in Sheep. 



355. In the lower jaw of the Sheep there are on each side 4 incisi- 

 form teeth, arranged in close series without any diastema. Of 

 these the outermost, known in veterinary works as " corner teeth," 

 are considered by zoologists as representing canines. 



The corner teeth or canines have been found in a considerable 

 number of cases actually shaped like canines instead of like the 

 incisors as usual. These teeth have been found presenting this 

 modification in several degrees, but in order to gain a fair view of 

 the matter it is necessary to read the evidence in its entirety. 



The facts given were founded on 18 animals, 15 ewes and 3 

 males [whether rams or wethers not stated]. In these 18 cases 

 there were 28 individual teeth of abnormal form. Of these 14 

 were conical with a point either sharp or rounded ; 7 were conical 

 with a bifid point ; 5 were cuneiform ; 1 was cylindrical with a 

 surface shaped like an ass' hoof; 1 was pyramidal. 



In 8 specimens the abnormality was unilateral and in 10 it 

 was bilateral, but in the latter the corner teeth of the two sides 

 were frequently of differing forms [details given]. Morot, Bull. 

 Soc. med. vet., 1887, p. 166. 



Pig". No case of Variation in incisors met with. 

 [This is perhaps singular in connexion with the fact that the 

 Peccaries (Dicotyles) have i -§.] 



356. Dicotyles torquatus (normally £§) : two specimens having 



3 2 



i-= ; in one of them i* of the side having the extra tooth is deformed. 



o — o 



Another young skull of Dicotyles also had 3 incisors on left side. 



Hensel, Sdugetldere Sild-Brasiliens, p. 94. 



Molars. 



357. Horse: supernumerary molars exceedingly rare; case of such a tooth in left 

 upper jaw, behind and in series with the others. Goubaux, Rec. med. vSt. } 1854, 

 Ser. 4, i. p. 71, same case, figured by Magitot, /. c, PI. v. fig. 9. 



* 



