630 MR, ST. GEORGE MIVART ON THE CRANIA_ [Nov. 22, 
skeleton of an individual which lived in the Society’s Gardens*. It 
came from the Cameroons river, and agrees with the specimen from 
Fernando Po. 
Galago ( Otolicnus) allentt. Seale, 14 nat. size. 
Right dental series of upper jaw. 
Dr. Gray, in his paper so often alluded to+, remarks on these forms, 
distinguishing one as ‘‘ var. gabonensis.” I think the two forms are 
decidedly distinct species. The first, G. (O.) allenii, from Fernando 
Po, has the ears very large, the last upper molar quadricuspidate, 
the second upper premolar with so large a talon as to approach nearly 
the third premolar in size, and the incisors placed much in front of 
a transverse line connecting the two upper canines; while the second, 
G. (O.) gabonensis (from the Gaboon and the Cameroons), has the 
ears considerably smaller, the last upper molar tricuspid, the second 
upper premolar differing rather more from the third in size, and the 
incisors placed so little in front of the canines that they are more or 
less hidden by the latter when seen laterally. 
Of the other species of G. (Otolicnus) I may observe that G. (O.) 
sennaarensist (of which there is a skull in the British Museum and 
another beautiful one in the Museum of the Royal College of Sur- 
geons) has the first upper premolar a little more canine-like than 
have the other species. There is also a very great difference between 
the size of the second and third upper premolars ; so that, as the last 
upper molar is but tricuspidate, this species differs from the other 
species of Galago (Otolicnus) in exactly the opposite direction from 
that in which G. (O.) allenii differs from them—namely, in having 
its upper grinding-series less equal than is theirs, instead of more so, 
though the third upper premolar is very large. 
The Slow Lemurs, by which I mean the genera Loris, Nycticebus, 
Perodicticus, and Arctocebus, with much general agreement, never- 
theless differ as to their dentition, as has been pointed out by Professor 
Huxley § in his memoir on the last-named genus. However, they 
all agree in having the mastoidal region of the periotic enlarged (as 
in the Galagos), and in having the foramen for the entrance into the 
cranium of the internal carotid plainly visible|| in the basis cranii, 
at the junction of the basi- and ali-sphenoids with the anterior end of 
* This is the specimen noticed by Dr. Sclater in Proc. Zool. Soc. 1863, p. 875, 
and figured in pl. xxx1t. 
+ Loo, cit, p. 146. 
+ The dentition is represented in Prof. Huxley’s article on Arctocebus: see 
ante, p. 320, 
§ See ante, p. 823, Ke. 
|| This is particularly large and conspicuous in Aretocebus, 
