CHARACTERS OF THE LEMURS AND TARSIUS. 



213 



the pinna, is set comparatively high up, approximately halfway 

 between the tragal notch and the upper edge of the pinna. 



In Chirogaleus (text-fig. 2, C) the ear is similar to that of Lemur, 

 but the ear of Microcebus is provided with a much larger pinna 

 which, judging from a living example, is ribbed above the capsule 

 and capable of being folded as in the Galagos. In the latter, as 

 is well known, the pinna is of great size. The portion of it just 

 above the capsule is ribbed and grooved and susceptible of 

 folding. The supratragus is more expanded and more flap-like 



Text-figure 2. 



A. Head of Tarsius. 



B. Head of Hemigalago demidoffi. 



C. Head of Chirogaleus major. 

 I). Head of Perodlcticus. 



Figures drawn from spirit specimens. All X f . 



than in Lemur and the pouch, probably the homologue of the 

 bursa of the ear of the Oarnivora, is set higher up than in the 

 Lemurs. Nycticebus and Perodicticus have the pinna, no larger 

 relatively than in Lemur, and it is simplified by the almost total 

 suppression of the tragal and antitragal thickenings ; but, as in 

 Galago, the pouch is set high up and the supratragus is flap-like 

 and valvular (text-fig. 2, D). As Mivart and Murie pointed out, 

 there is a small fold of the integument above the supratragus in 

 Nycticebus, and a similar but better developed fold is developed 



