500 Mr. O. Thomas on small Mammals. 
thicker and more strongly curved than in any other member 
of the genus, the incisive angle 83°. Molars broad and 
heavy, the series more bowed out mesially than in other 
species. 
Dimensions of the type :— 
Head and body 400 mm.; tail 350; hind foot 95; 
ear 74. 
Skull: greatest length 88°5 ; condylo-incisive Jength 81 ; 
zygomatic breadth 46°5; nasals 32°7x113; suprameatal 
islet 6X6; palatal foramina 15°5 x 4:6 ; dihnbter of bullee 
at right angles to their longest axis 13 ; upper tooth- i 
length (alveoli) 20, greatest bread h across the two series 22 
breadth of m', on lamina, 5°6. 
Type. Adult female (b basilar suture closed, but its position 
perceptible). B.M. no. 19.2.7.57. Original number 333. 
Collected 24th August, 1918. 
The members of this genus appear to be more constant in 
their skull-characters than has been supposed, and I find that 
five adult skulls of Z. twcumanum agree closely among them- 
selves and equally differ from the present specimen in the 
characters above referred to. ZL. cuscus, from Bolivia, more 
distant in locality, has a skull rather more similar to that of 
L. lockwoodi, but has smaller bullee and no tendency towards 
the abnormally heavy incisors of the new form. 
Philippi’s L. crassidens, without locality, named incidentally 
in his description of L. dutescens * (itself apparently referable 
to L. cuvieri), would appear to be the ordinary Chilian form 
L. viscaccta, Mol., and is certainly not L. lockwoodi, as the 
visibility from below of the nasals outside the premaxillee is 
especially insisted on, this being in distinct contrast to the 
conditions in L. lockwoodi, while it is not bea found 
in L. viscaceia. 
In naming this fine mountain chinchilla after Mr. Charles 
Lockwood I may again refer with gratitude to the great 
assistance whe has’ been din arranging all the financial and 
business details of the Budin expedition, an assistance without 
which we should have found great difficulty in carrying it on. 
14. Galea sp. 
dS. 358 (immature). 
* Ann, Mus. Chili, pt. 18, p. 8 (1896). 
