KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 58- N:0 2- 13 



Iii the young female n:o 39 i 1 are developed and in function. In the lower jaw /, 

 ha ve eonie up, bnt they are still obliquely crowded and may thus hardly ha ve come into 

 function. m- and i 1 are just cutting the gum. The same is the condition of the lower 

 jaw, but the anterior end of m, has reachcd further than i,. The calcified germs of m 

 and ut* are also to be seen in their resp. cavities through holes in the bone. There is also 

 a hole in the bone inside dp 2 . 



In the young male n:o 40 m- and ///. are fully developed and in use. The same 

 is also the case with regard to i 2 , but it appears to have been in function a somewhat 

 longer time on the left, than 011 the right side. In the lower jaw i 2 is on the right side 

 fully developed and functioning, but on the left it has not yet reached the level of the 

 jaw bone. This stånds evidently in connection with the narrowness of the jaw which has 

 not space for the simultaneous development of both i t . In this jaw the interspace on 

 the left side between i lt and de is not broader than between i., and de on the right 

 side, although di, on the left side has fully disappeared. There are rather large holes in 

 the bone inside de, dp t , and dp, in the lower jaw, but in the upper they are rather 

 small except at the canines. 



From these facts may be concluded that the canines probably come as number 

 tive of the permanent set, and that the permanent premolars in the lower jaw develop 

 somewhat earlier than those of the upper. 



In the semiadult male 11:0 165 all teeth are in function except m 3 on the left side 

 and the posterior part of its fellow. The third upper molars are thus the last of the 

 whole set. 



In the old male with worn teeth (Pl. II & Pl. III, lig. 1) the lower incisors and 

 canines are more worn than the upper. The left upper canine has been broken off and 

 the right lower, one is complctely broken ont and the jaw bone has healed so that the 

 alveole has filled up. This mutilation has probably happened in some fight with a rival. 



From the easternmost frontier of the geographical area of the Gorillas two differenl 

 forms have been described, which both distinguish themselves from the western Gorillas 

 by their great palatal length and their long black fur. These are Gorilla beringei Matschik 1 

 from the volcano Kirunga ya »Sabinyo north of Lake Kivu, German East-Africa, and 

 Gorilla graueri Matschie north west from Boko at the western shore of Tanganyika.- 

 As the first of these localities appears to be not so very far distant from the volcano 

 Mikeno among the Virunga mountains, where the Gorillas of the present collection have 

 been collected, it could almost be expectcd that they should belong to the species named 

 67. beringei. Undoubtedly they are closely related to the same, but there are also import- 

 ant differenecs to be found, if for instance the dimensions of the old male skull of the 

 collection are compared with the corresponding ones of the adult male 67. beringei. 



If this comparison had been confined to an examination of the present material 

 and a comparison of its measurements with those recorded by Elliot in his »Review of 

 the Primates » I would have been complctely led astray. Fortunately I knew, however, that 

 this work has to be handled with care, and that it is best not to rely too much on the 



1 Sitz.bor. Ges. Natuif. Freunde, Berliu 1903. 

 - Sitz.ber. Ges. Naturf. Freunde, Berliu 1914. 



