Contribution to the Knoiuledge of the Cape Golden Moles. 307 



which agree very closely with those in the more generalised species 

 such as C. sclateri, but being larger and apparently more primitive 

 they clearly show traces of the two cusps which have been con- 

 tracted into one. In the lower jaw all the molars have the posterior 

 talon. 



The skull has a large bulla for the dilated head of the malleus, 

 but it is much hidden by the great development of the posterior part 

 of the zygomatic arch. There is a fairly large crest on the top of 

 the skull between the temporal muscles. 



There can be no question of the distinctness of this species from 

 C. villosa. It is not merely a matter of size ; the proportions of the 

 skull are altogether different. 



't)" 



Summary. 



The following table gives a convenient comparison of the size and 

 proportions of the skulls of typical representatives of the different 

 species : — 



Length. Breadth. Dental Series. 



C.trevelyani 42 26 17 



C. villosa 34-5 21-8 13-3 



C. hottentota 27 17 10 



,, longiceps 30 19*5 11 



corricE 28 16-6 10-5 



iris 25-4 15-5 10 



var 23 — 8-7 



C. sclateri 23-2 15-5 9'6 



C.duthiecB 23 14-2 9-3 



C. ohtusirostris 24 17 — 



chrysilla 22 15-6 9-2 



C.asiatica 23*3 19 10 



C.iuintoni 21*3 16-2 9 



C. namaquensis 21 15-3 9*5 



C.granti 19-6 17 8-5 



C. tenuis 21-2 15-2 9-7 



From an ancestor like C. trevelyani it seems probable that there 

 have been three distinct lines of descent. One of these has termi- 

 nated in C. villosa. In the second the skull became relatively short, 

 but the molars rather simpler. C. asiatica, with its 40 teeth and 

 large temporal bulla, is possibly the most primitive member of this 

 line that survives, though its distance from C. trevelyani is very 

 considerable ; C. lointoni and C. namaquensis are not far removed 

 from C. asiatica. C. granti is apparently on the same line but more 



