138 



DR. C. I. rOHSYTH MAJOR ON THE 



[Feb. 19, 



In the group of large-sized Galagos (stibgen. Otolemur) (text- 

 fig. 34) the lacrymal is not only absolutely larger than in the other 

 subgenera, but also comparatively so. Withiu the orbit the lacrymal 

 is delimited laterally by the maxilla, medially by the os planum. 

 The maxilla, besides bordering the fossa lacrymalis and forming 

 the anterior roof of the canalis I., penetrates also into the fossa, 

 the bottom of which it forms jointly with the lacrymal. In 

 young specimens the malar joins the lacrymal. 



Text-fig. 34. 



Text-fig. 35. 



Text-fiff. 36. 



Text-fig. 34. Orbital region of Galago (Otoleiiiwr) crasskaudattis (Br. M. 



No. 92.10.18.10), about nat. size. 

 Text-fig. 35. The same of Tarsius philippinensis (Br. M. No. 97.3.1.1), about f 



nat. size. 

 Text-fig. 36. The same of Galago (Otoliciius) alleni (Br. M. No. 99.4.6.5), about 



nat. size. 



(Lettering as in text-fig. 26.) 



Galago (OtoUcnus) senegalensis (four specimens). — In some in- 

 dividuals t\xe pars orhitalis I. is extremely reduced, the maxillary 

 (laterally) and the os planum (medially) almost reaching the 

 crista poUerior. The whole of the boundary of the fossa and part 

 of its bottom is provided by the maxilla. In three young speci- 

 mens the malar is separated from the lacrymal by a very thin 

 process of the maxilla ; iu the fourth, an aged specimen, the bones 

 are more widely separated. 



Galago (Otolicnus) alleni (four specimens) (text-fig. 36). — The 

 porfcio orbitalis is slightly larger than in the preceding species. 

 The whole of the fossa is encircled by the maxilla, which also 

 enters the fossa, with the result that its bottom is only to a 

 limited extent occupied by the lacrymal ; in one instance the latter 

 does not even reach the aperture of the canalis I. In one of the 

 four specimens the malar is in contact with the lacrymal; in a 

 second, young specimen, a strong lens is required to perceive the 

 thin strip of maxillai*y dividing the two bones. 



Galago {Otolicniis) elegantulus (four specimens). — In two of the 

 skulls the lacrymal sutures are mostly obliterated, although the 

 teeth are only moderately worn. In the two remaining speci- 

 mens (Br. M. No. 1410 a & h) the lacrymal is either so much 

 reduced in size, or so much covered by the adjoining bones, that 



