1888.] 



NATURAL SCIENCES OF PHILADELPHIA, 



267 



peculiarities of the nose the roof of the mouth is distinguished by a 

 small incisive pad and coalescence of the sutural and the third post- 

 sutural folds. The tonsils are moderately enlarged. 



Figure 8. 

 The arch is narrow and high, the pre maxillary portions being 

 thrown forward. Hence the space between the sutural rugje and the 

 incisorial pad and all the parts in advance of the sutural rugse are 

 exceptionally open. The third post ruga; is confluent with the sutural 

 on both sides. The pre sutural ruga; are absent. 



The Relation between the Rug.e and the Teeth. 



The relation existing between the rugpe and the teeth is not as 

 important as would at first sight nppear. For the pre-maxilla it 

 may be said that no influence is exerted by the incisor teeth over 

 the pre-sutural rugae. The sutural ruga is directly opposite the 

 canine teeth, the first post-sutural, directly between the canine and 

 the first bicuspid, the second ruga opposite the bicuspid, etc. In 

 the Proceedings of the Acad, of Nat. Sci. of Phila. p. 310, 1882, I 

 proposed a system of naming of the parts in accordance with these 

 facts. But it is less satisfactory than the one used in this paper. 



Nevertheless the following statements would confirm the position 

 assumed that some connection between the rugse and the teeth must 

 be accepted to exist. 



