1892.] 



NUMERICAL VARIATION IN TEETH. 



109 



class, though the materials which support this view cannot easily be 

 given in brief. 



Partial or complete reduplication of teeth occurring in the second 

 way was seen in P. grcenlandlca (p^), Otaria cinerea ('^), Ganis me- 

 somelas (p^), Vison horsfieldii (]?)> Ilerpestes orientulis (P'), Herpestes 

 gracilis ()?), Felis domestica (p'), ditto (p^), Phalanger orientalis (ij), 

 &c. 



The power of a single organ to reproduce itself is of course not 

 confined to teeth, but will be shown to be present in many different 

 kinds of organs, and especially in those which are 'arranged as a 

 Series of Multiple Parts. 



Variation in Terminal Teeth when a new member is added to the 



series. 

 This is a phenomenon which is most instructive as a guide to the 



Fig. 3. 



C'a7iis azarcB, from specimens in the Leyden Museum. 



I. Eight, upper molars of a specimen having a supernumerary third molar on 

 each side. II. The right lower jaw of the same. III. and IV. The 

 right upper and lower jaws of a normal skull of rather larger absolute 

 size, to show the increased size of the teeth in the abnormal specimen. 

 C. The carnassial tooth. 



nature of the process by which Multiple Parts are formed. It may 

 be stated generally that if the tooth which is the last of a normal 



