138 EINAR LÖNNBERG, MAMMALS COLLECTED BY THE SWEDISH ZOOLOGICAL EXPEDITION ETC. 
Mau, although the former belong to different sexes and are of different age. This 
likeness consists therein that the nasals are shorter so that their posterior end is 
considerably in front of the anterior suture between the lacrimale and maxillare. At 
the same time the posterior half of the nasals is flatter, especially opposite foramen 
infraorbitale than in the specimen from Mau. In the latter the nasals extend further 
backwards so that their posterior ends are on a level with the anterior suture between 
lacrymale and mazxillare. The posterior half of the nasals are rather strongly vaulted 
in the specimen from Mau so that the distance from the alveolar brim opposite 
foramen infraorbitale to the median nasal suture is 85 mm., whereas the same mea- 
surement in the very much bigger boar-skull from Kenia is only 82 mm., and in the 
female skull from Kenia hardly 73 mm. Whether this is a racial characteristic, or 
individual variation cannot be decided on the present material. The agreement of 
the Kenia specimens, although they are of different sex, is, however, worthy of being 
pointed out. 
Considering the dentition it is of interest to note that in the female skull from 
Mau dp" on the right side has fallen out and given place to a comparatively small 
p', while on the other side dp" is still in use. This is in accordance with observa- 
tions made by ROTHSCHILD and NEUVILLE (1. c. p. 153). In the female skull from 
Kenia dp! on both sides are still retained but the tooth is on the verge of being 
pushed out with the roots partly resorbed, especially posteriorly on the outer side. 
In the Mau specimen the dentition is, or has been more complete even than in 
the somewhat younger specimen from Kenia. In the former there are open alveoles 
in front of p? for p? which has, however, fallen out probably after the death of the 
animal. In the lower jaw there are in front of p, two small open alveoles which 
probably have belonged to dps. On the right side there is in addition to this a 
rudimentary but not very small tooth sunk in the jaw. Its length is about 8 mm., 
and its breadth 6 mm. As it is situated much nearer (distance 24 mm.) the canine 
than the alveoles of the presumed dps (distance 40 mm.), it must be considered to 
be dp;. 
In the female Kenia-specimen there is only a very small alveole somewhat in 
front of p”, and nothing in front of p, in the lower jaw. 
The Mau-specimen is well provided with incisors as well. About 10 mm. behind 
i' a tooth is situated which appears too strongly developed to be a milk-tooth and 
which as I presume ought to be regarded as i”. Its cutting edge has a length of 
fully 7 mm., and its basal parts are stout as well. 
In the lower jaw on the right side there is a quite strongly developed tooth 
behind ;i,;. Its crown has a length of 11,5 mm., and a thickness of nearly 5 mm. 
It differs very considerably in its shape from the slender di; of a Hylocherus as 
figured by ROTSCHILD and NEUVILLE (l. c. Pl. 7), and I must consider this tooth to 
be is. MaATsSCHIE has also found i; in a specimen of his Hylocherus ituriensis." On 
! Ann. du Mus. du Congo. Zool., Ser. V, Etudes sur la Faune Mamm. du Congo, T. 1, Fasc. 1. 
