102 MAMMALIAN DENTITION 



In a work of restricted size many important types must 

 necessarily be omitted. It would be inexcusable however 

 to pass over the Zalambdodonts without at least some refer- 

 ence, although for obvious reasons they cannot be fully con- 

 sidered. With these animals should be grouped the Marsupial 

 Mole, Notoryctes which presents a similar type of dentition. 



A specialized representative of the Zalambdodonts is Chryso- 

 chloris trevelyani, the largest of the Cape Golden Moles (Fig. 

 32). This fossorial animal belongs to a family Avhich is 



! !JJ ! ! 1 1 i L! ! 1 1 IJJ I til 1 1 II 1 i JllLli I 111 J 111 1 111 1 IllllltliU 



Fig. 32.— Dentition of Cape Golden Mole (Chrysochloris trevelyani, 9.335-1). A repre- 

 sentative of the most primitive type of living Mammals. 



probably more primitive than any other group of Mammals 

 now living. So far as is known its food consists mainly of earth- 

 worms but the dentition differs greatly from that of other 

 Moles although paleontology shows it to have been derived 

 probably from the same stock as the Dilambdodonts. The tooth 

 formula is: 



I-l, Ct.Pt.m|. total 40. 

 2 14 3 



The upper median incisors are nearly vertical but are large 

 and their tips approximate. This, together with the inflection 



