208 Mr. O. Thomas on small Mammals 
These specimens agree sufficiently closely with Philippi’s 
figure and description of Oxymycterus valdivianus to render it 
fairly certain on geographical grounds that they should be 
referred to that animal. The question of its generic name is 
dealt with below. 
“‘ Live among the roots of fallen trees. Make burrows in 
the earth like tuco-tucos.”— EH. B. 
15. Geoxus fossor, sp. n. 
&. 178,194. Maiten, W. Chubut. 700 m. 
“ Found under bushes (‘retamos’), where they make holes 
with small hillocks over them, just like tuco-tucos. The 
similar mice from Nahuel Huapi do not make such hillocks.” 
—H. B. 
The six long-clawed Murines placed under these two 
headings have enabled me to make a fresh examination of 
the relationship they bear to my Wotiomys edwardst, to the 
genus Oxymycterus, and to the far southern species that have 
been referred to the latter. 
I have to confess that Dr. Allen’s assertion that his Oxy- 
mycterus microtis (to which these specimens are closely allied) 
had nothing to do with Notiomys proves to be entirely correct, 
my supposition to the contrary being wrong. Thanks to the 
kindness of Prof. Trouessart, I have been privileged to 
re-examine the type-skull of Notiomys edwardsi, and so am 
able to base my opinion on a firm foundation. 
Of pertinent specimens we had previously only the two 
examples, adult and young, from Koslowsky mentioned in 
1903*, which, without sufficient reason, I assumed to be 
both of the same species. ‘he young one (whose skull was 
crushed) being certainly Notiomys, and the other closely 
agreeing with “ Ovymycterus”’ microtis, Allen, the generic 
identity of the two seemed to follow. 
But study of the present valuable accession shows that the 
two Koslowsky animals are really different—the young one 
being Notiomys edwardsi, ‘Thos., and the adult the species 
described by Dr. Allen. 
On comparing now the good skulls of the mole-like animals 
related to “‘ Oxymycterus”’ microtis in Sr. Budin’s collection 
with the type-skull of Notiomys, I ean confirm all that 
Dr. Allen ¢ has said as to their essential distinctness. In the’ 
former the skull is long and narrow, with long muzzle, smooth 
* Ann, & Mag. Nat. Hist. (7) xii. p. 248 (1903). 
+ Mamm. 8. Pat. pp. 81-85, illustrated by figures of skulls, pl. ix. 
(1905). 
— Se 
ES ee 
