624 MR. ST. GEORGE MIVART ON THE CRANIA_ [Noy. 22, 
ingly remarkable had M. pusillus really had that affinity to the 
Galagos which has been so often assumed. 
This next type of structure is presented by various species which 
have been arranged in several distinct groups, but which, I believe, 
constitute only one natural genus, though a large and somewhat 
varied one, admitting perhaps of subdivision into more or less doubt- 
ful subgenera. This large genus, Galago, contains, as I apprehend, 
Otogale, Callotus, and Galago of Dr. Gray, together with Otolemur 
of Dr. Coquerel, and Hemigalago of Dr. Dahlbom. It is well repre- 
sented in the British Museum by a number of skins, skulls, and two 
complete skeletons, besides several specimens in spirits. As far as I 
have been able to observe, the whole of the species included in the 
genera above enumerated agree in the possession of the following 
common characters :—The ears are largely developed and more or less 
naked; and the tail is long. The foot is always long also; and this 
elongation is produced by the great length of the caleaneum and na- 
viculare only*, not, as in Chetrogaleus, by the prolongation of the 
astragalus, nor by having a cuboid almost as long as the naviculare, 
as is the case in Microcebus. 
Fig. 1. Fig. 2. 
Fig. 1. Tarsus of Microcebus; Fig. 2. Tarsus of Galago. From De Blainyille’s 
‘Ostéographie,’ but represented with the caleaneum (A) and cuboid (B) 
together of the same total length in each figure, the better to show the re- 
lative extent of the naviculare (C). 
The length of these two bones (the caleaneum and naviculare) when 
in their natural position, and measured from the distal extremity of 
the second to the proximal end of the first, always exceeds four 
times the breadth of both bones measured at their narrowest parts, 
and when in their natural position also. The calcaneum is always 
more than one-third the length of the tibia. 
In the skull the mastoidal region of the periotic is enlarged and 
* This is still more markedly the case in Tarsius. 
