722 



THE EXTERIOR OF THE HORSE. 



We have made a similar observation upon a horse brought to the clinic of 

 the Alfort School in 1842.' His mouth presented a double row of incisors of the 

 second dentition in each jaw, — in other words, he had twenty-four in all. 



Fig. 308. — Two supernumerary pincers, o, a, and 

 one intermediate, of the second dentition. 



Fig. 309. — Two supernumerary intermedi- 

 ates, a and h, of the second dentition. 



Such remarkable examples as these are very rare, but there are others rela- 

 tively more frequent : those of augmentation of number, which involve the teeth 

 of one or of both jaws, or consist in a doubling of these incisors. We have 

 several times had the opportunity of witnessing these anomalies, more especially 

 in the superior jaw. 



Superior Jaw. — We have handed to Dr. Magitot '^ several specimens, which 

 he reproduced in his beautiful treatise upon the " Anomalies du Systeme Den- 

 taire." We will limit ourselves here to a few examples. 



In one case (Fig. 308) there existed two supernumerary pincers, a, a, and one 

 intermediate, b. 



In another (Fig. 309) the supernumerary teeth were two intermediates, a and b. 



In a third horse (Fig. 310) the anomaly consisted of one supernumerary in- 

 termediate, a, lying transversely and kept in position against the incisive arch 

 by a small bridge of bone. 



Finally, in a fourth (Fig. 311), a pincer, a, equally displaced, was found. 



All these incisors were of the second dentition.^ 



1 Arm. Goubaux, Des aberrations dentaires chez les animaux domestiques, in Recueil de 

 m6decine vete'rinaire, ann6e 1854, p. 70. 



2 Magitot, Trait6 des anomalies du systfeme dentaire chez I'homme et les mammif&res, in-4o, 

 Paris, 1877. 



a See, also, Ch. Morot, Incisive suppl^mentaire caniniforme si la machoire sup^rieure d'un 

 cheval hongre de douze ans, in Recueil (Bulletin de la 8oci6t6 centrale de m^decine v6t6rinaire), 

 Mars, 1888, p. 138. 



