KTJNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 48. N:0 5. 



129 



South of Guaso Nyiri 



Basal length 



Condyloinoisive length 



Greatest breadth of skull 



» » » brain-case 



Least interorbital breadth .... 



Greatest length of nasals 



» breadth of nasals behind 



Breadth of nasals at anterior end of naso-premaxillary suture 



Distance from orbit to tip of prernaxillary 



Length of upper molar series 



Greatest breadth of premaxillaries in front 



Length of palate mesially 



The canines are strongly developed in the stallions, in the mare they are small 

 but present as well in the upper as in the lower jaw. A small p^ is present on the 

 left side of the upper jaw of the old mare, and in a young stallion in which the 

 last molar has not yet cut the gum the p' is present on both sides. It appears thus 

 probable that these teeth are normally developed in all specimens but being function- 

 less soon fall out. 



A young stallion from Njoro with a condyloinoisive length of 585 mm. has a 

 skull which is even larger than that measured above, although this was a very fine 

 middle-aged specimen, among the largest in the herd, and considerably bigger than 

 an old stallion shot at the same time. In this young stallion from Njoro the per- 

 manent dentition is not yet fully developed. The condition of the dentition is as 

 follows. 



Upper jaw: i^ in use and worn. 



i^ just cutting the gum, 



di^ in use. 



c in a level with the jaw bone. 



p\ p^, p^ in use. 



p* not yet fuUy in a level with the other teeth. 



mS m^ in use. 



>3 



Lower jaw: 



m" just appearing, 

 ij in use and worn 



ig just visible on the left side, on the right dig still in use. 



dig in use. 



c the upper edge not yet at the upper surface of the jaw bone. 



Pa, Pa in use. 

 dp4 in use. 

 mi, ma in use. 

 mg just appearing. 



St. Vet. Akad. Handl. Band 48. N:o 5. 



17 



