658 THE EXTERIOR OF THE HORSE. 



The intermediates are round, and the corners tend to assume this 

 form. The dental star, more apparent in all the teeth, is situated 

 rather in the middle of their tables. The incidence in profile is still 

 more oblique. (Plate XXIII.) 



Eleven Years. Roundness of the corners and of the interme- 

 diates. The central enamel forms a more or less small island, placed 

 very close to the posterior border of the teeth. The dental star, nar- 

 rower transversely, is found on the middle of the surface of friction. 

 The inferior corners, viewed in profile, are more narrow and almost as 

 wide at their base as at their free extremity ; the gum extends squarely 

 across their base. The superior corners, more oblique, show a new 

 notch ; they are levelled or at the point of becoming so. (Plate 

 XXIV.) 



Twelve Years. All the teeth are round, and at times the central 

 enamel has disappeared. Frequently, however, a slight trace of the 

 latter still exists in some of them. The tables in which this enamel 

 does not exist present in their centre a yellowish spot, rather small, 

 which is the dental star. In the superior corners the central enamel is 

 very small. The two incisive arcades are much narrower from side 

 to side, and less convex on their anterior face. The tongue projects 

 beyond the bars ; the inferior border of the maxillary bone is becoming 

 sharp ; the cheeks are flattened and the face hollowed upon its lateral 

 surfaces. The incidence of the incisive arcade has augmented in incli- 

 nation, especially when the teeth have acquired considerable length. 

 (Plate XXY.) 



Thirteen Years. The signs of the preceding age are more 

 marked. The superior corners are ordinarily completely levelled or at 

 the point of becoming so ; they have a well-defined notch when exam- 

 ined in profile. The central enamel is absent in the inferior incisors ; 

 in the superior pincers it has a rounded form. (Plate XXVI.) 



Fourteen Years. The pincers tend to assume the triangular 

 form. The incisive arcade appears greatly depressed in profile and 

 narrowed transversely. 



Fifteen Years. Triangular form of the pincers ; this is only 

 beginning in the intermediates. The dental star is very distinct and 

 round in all the lower incisors. The central enamel on the superior 

 pincers is much smaller. (Plate XXVII.) 



Sixteen Years. The characters of the preceding age more 

 marked. Triangular form of the intermediates. 



Seventeen Years. All the inferior incisors are triangular ; their 

 dental star is round ; the central enamel of the superior pincers has 



