THE AFRICAN GALAGOS. 39 
the orbits are, according to Dr. Forsyth Major, much broader 
vertically and horizontally in the genus Galago. ‘The squa- 
mosal region of the skull and the outer portion of the ear-cap- 
sules (the periotic) are large and inflated. The mandible (or 
lower jaw) has its lower hind edge, or angle, produced backward. 
The dentition of the Galagos presents several important 
characters. In respect to their upper teeth, the incisors are 
small, equal, and have a hind cusp on the cingulum. A 
distinct gap exists between the canine and the pre-molar teeth. 
Of the pre-molars, the anterior one is canine-like, and is equally 
distant from the canine and its own next neighbour. To the 
outside it has one main cusp, and generally one minute sup- 
plementary cusp on each side. ‘The median pre-molar shows 
three cusps, and one strong inner front cusp. The posterior 
pre-molar is always molar-like. It has one front supplementary 
and two main cusps to the outside; and one front and one 
supplementary hind cusp to the inside: it has also on the 
crown the oblique ridge spoken of above. 
The molars have a deep concavity on their hind border, due 
to the development of the cingulum on the inner half only 
of that border of the tooth; to the outside they present two 
main cusps (and often supplementary minute fore and hind 
cusps); while to the inside they present two cusps, and also 
an intermediate cusp in front between the two fore cusps ; the 
oblique ridge is also here present; the hindmost molar is 
three-cusped. The five hind molars are, therefore, nearly 
equal in size. In the lower jaw the pre-molars are complicated. 
The anterior and median are canine-like and procumbent, with 
a cusped heel behind; the posterior is distinguished from a 
molar only by the lesser size of its fore-part. The molars are 
also complicated ; the anterior and median are equal in size 
