529 



3145. The right moiety of a vertically bisected skull of a young Horse. 



It has not acquired its second and third permanent incisors, the permanent canines, the last 

 premolar, or the last true molar. The remnant of the crown of the last deciduous molar is 

 still retained. The individual bones are numbered, on coloured labels, corresponding to the 

 TABLE OF SYNONYMS. 



Presented by Henry dine, Esq. 



3146. The skull of a Mare, of more advanced age. 



In this the deciduous incisors hape been shed, and the first and second permanent incisors 

 of both jaws have come into place. The minute deciduous canines are still retained in the 

 lower jaw. 



Purchased. 



3147. A section of the skull of a Horse, including the molar series of the left side of 

 the upper jaw. 



The first rudhnental tooth is retained, completing the normal number of four premolars 

 and three true molars. The last premolar, having been the last to be developed, projects 

 further than the rest, probably from its development having been in advance of that of its 

 homotype below. 



Hunterian. 



3148. The left moiety of the facial part of a longitudinally bisected skull of a Horse, 

 with the permanent series of teeth complete and exposed in their sockets. 



The character by which the equine molars may best be distinguished from the teeth of other 

 existing Herbivores corresponding with them in size, is the great length of the tooth before 

 it divides into fangs. This division, indeed, does not begin to take place until much of the 

 crown has been worn away ; and thus, except in old Horses, a considerable proportion of 

 the whole molar is implanted in the socket by an undivided base. This is slightly curved in 

 the upper molars. 



Hunterian. 



3149. The fore part of both upper and lower jaws of a young Mare, showing the 

 deciduous incisors. The excavated summits of the middle permanent incisors 

 are exposed in the upper jaw. Presented by Bransby B. Cooper, Esq., F.R.S. 



3150. The fore part of the upper jaw of a Horse, of about five years of age, with the 

 permanent incisors and canines, and the inflected fold of enamel still remain- 

 ing in all the incisors, but most shallow in the mid-incisors, which were first 

 developed and in use. Presented by Bramby B. Cooper, Esq., F.R.S. 



ST 



