PAPIO CTNOCEPHALUS. 
77 
no, 3) is only 3 mm. longer than the skull from Fort Johnston, the latter being nearly 
6 mm. longer than the Langenberg skull, so that there is a series of adult skulls, varying 
from 192 to 204 mm., substantiated by their skins. 
When the dentition of these five males is examined, it will be seen, by consulting 
the accompanying Table (IV.), that the Lamu individual has all its teeth as large as or 
larger than the others, and that the Ukami skull takes precedence of the remaining 
three. The first and last lower molars of these two skulls are of the same size, but the 
other teeth of the Lamu skull are somewhat larger than those of the Ukami individual. 
The Langenberg skull, which is from a locality about 440 kilom. to the south-west of 
Ukami, has all its teeth smaller than the Ukami baboon, but to a trifling extent, viz. 
fractions of a millimetre, with the exception of the last lower molar, which is 1*7 mm. 
shorter antero-posteriorly than the corresponding tooth of the Ukami skull. The 
baboon from Fort Johnston, the next geographical position to the south, has some of 
its teeth smaller and others larger than those of the last skull, but only to the degree 
of fractions of a millimetre. The Zomba skull, which comes from a locality not far 
removed from Fort Johnston, when contrasted with the skulls from the foregoing 
localities to the north, gives the following results :— 
Differences between teeth of 
Upper molars. 
Lower molars. 
A 
Zomba skull and— 1. 
2. 
A 
H. 
1. 2. 
3. 
Fort Johnston skull. -l-'8 
+ 1 
= 
= - -3 
-1 
Langenberg skull.— 
+ •2 
= 
-1--4 - -2 
-1-3 
Ukami skull. ? 
= 
- -3 
= _ -7 
-3 
Lamu skull.—1 
-■5 
-1-5 
= -1*2 
-3 
If the last lower molar is alone considered. 
, it would 
appear 
from this statement that 
this tooth diminishes in size between Lamu and Zomba, and there is thus an ascending 
series from south to north: Zomba 13 mm., Fort Johnston 14 mm., and Lamu 16 mm. 
But if the skulls unauthenticated by their skins are admitted to the series, and there 
does not appear to be any reason why they should not, because they so conform in their 
essential features to the Lamu skull that they may be accepted as identical with it, 
then the series becomes more instructive. These skulls prove that although the five 
skulls just considered are adult, they do not represent the full size to which the 
species may attain (see Table II.). They establish that the species is characterized by 
considerable variations as to the size of the teeth, and when the teeth of these large 
individuals are tabulated along with, the others (see Table IV.) the variation of the 
third lower molar is seen to be considerable. The baboon from Mpapwe has this tooth 
as much as 17 mm. long, whereas in the Zomba baboon it is only 13 mm.; but another 
individual from Mpapwe has its last lower molar only 2 mm. longer than the Zomba 
