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. 

 Ofthepre-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 oh t])e 

 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 

 obhque 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 



