112 



Nachdruck verboten. 



Two Cases of supernumerary Molars : with Remarks on the Form 

 of the lower Cheek-Teeth of the Horse. 



By 0. Charnock Bradley, M. B., F. R. S. E., ßoyal Veterinary College, 



Edinburgh. 



With 2 Figures. 



Cases of additional incisor teeth in the horse are of sufficient 

 frequence to cause not more than passing interest. But instances of 

 supernumerary molars in the Equidse are of such rarity that there 

 is no necessity for expressing at length a justification for their publi- 

 cation. The literature, so far as I can discover, only contains parti- 

 culars of six such cases; of wich five occurred in the horse, and one 

 in an ass. The first reference to such an occurrence that I can find 

 is given by Magitot (1) in his work on dental anomalies. In this 

 instance the additional tooth was on the left side of the upper jaw. 

 Hensel (2) states that he has a horse's skull in which there is an 

 extra molar on both sides of the lower jaw. He further informs his 

 readers that his colleague. Dr. Crampe, has a horse's skull with 

 supernumerary teeth on both sides of the upper and on the left side 

 of the lower jaw. During the course of the year 1902, I described 

 a case in which there were well developed m* on both sides of the 

 upper jaw. The mandible of the skull was missing, but I have adduced 

 reasons for concluding that it did not contain more than the usual 

 complement of teeth. In the same paper I gave fuller details of an 

 instance of supernumerary molars occurring in the skull of a Spanish 

 she-ass in the Museum of the Royal College of Surgeons, London, 

 which had been previously mentioned by Bateson (4). In this ass 

 the extra teeth are present on both sides of the upper and on the 

 left side of the lower jaw. The latest contribution to the subject 

 consists of a short note and illustration given by Hayes (5) of an 

 example of an additional molar on the left side of the mandible of 

 a ten-year old horse. 



Of course it is very possible that many more cases have been 

 noticed but not recorded. And it is also probable that cases are 

 never discovered owing to the retired position of the cheek-teeth. 

 But even allowing for some extra molars being overlooked, and some 

 that are seen not being recorded, there is still sufficient ground for 



