1904,] MAMMALS PROM NAMAQUALAND. 181 



13*8 ; length of upper tootli-sei-ies (crowns) 8*4 ; combined breadth 

 of uppei' incisors 5, 



Tyin. Female. Original no. 545. Collected 3 August, 1903. 



This handsome and distinct Mole-Rat is widely different from 

 the only hitherto known species of the genus. A reference to the 

 occurrence of Batliyergus in Namaqualand is given by W. L. 

 Sclater*, but he tells us that he had not seen examples from 

 there, and his informant had no doubt mistaken B. janetta for 

 B. maritinitis. 



In this species there is a marked difference in size and in the 

 development of the cranial ridges between the skulls of males and 

 females, much more so, indeed, than appears to be the case in 

 B. maritvinus. An old male skull of B. janetta measures 48*5 mm. 

 in basilar length, with a zygomatic breadth of 36 mm. 



" ' MoUee ' of the Dutch. 



" Common on the white sands near Port Nolloth, where it 

 makes regular I'uns and mounds. 



" It is a great nuisance to the platelayer on that section of the 

 line, undermining the sleepers and often causing a dangerous 

 drop in the metals when a train passes." — C. H. B. G. 



22. Petromys typicus Smith. 



d . 444, 517, 522, 518. $ . 487, 480, 500, 443, 513, 529, 469. 

 Klipfontein. 



The Museum now obtains for the first time a good series of this 

 uncommon animal, which was described by Smith in 1831 from 

 specimens collected by him " upon the rocky hills which occur 

 towards the mouth of the Orange River." Dr. Broom also 

 obtained some examples at Port Nolloth. 



The dimensions of an adult male, measured in the flesh, are as 

 follows: — Head and body 160 mm.; tail 160; hind foot 34; 

 ear 15. 



" ' Klip-muis ' of the Dutch. Noki f of the Namaqualand 

 Hottentots. 



" Very common, frequenting the rocks on the kopjes and 

 mountains and the slides of loose stones thrown out of the 

 railway-cuttings. Each one seems to have his own hole, and can 

 be seen day after day lying in the sun on some favoiu-ite spot in 

 front of it. Often in the early morning sevei-al are to be seen up 

 a bush, feeding on the leaves." — C. H. B. G. 



23. Lepus saxatilis Cuvier. 



S . 452, 520. 2 ■ 525. Klipfontein. 

 " ' Rhebok-haas ' of the Dutch. 



" Frequenting the open flats on the top of the mountain-range, 

 the lower slopes of the kopjes, and the dry river-beds. 



" Common, but exceedingly difficult to find without a dog. 



" Feeds only in the early morning and late evening." — 0. H.B. G. 



• * Mamm. S. Afr. ii. p. 73 (1901). 



t The " N " of Noki is sounded as a click. 



