050 



PROSIMIAE. 



face. It has been asserted that the Madagascar lemurs differ 

 from others by the fact that the tympanic bone is reduced to 

 a ring, and the bulla is formed by the periotic (F. Major, P.Z.S. 

 1899, p. 987). 



The hind-legs are always longer than the fore. The humerus 

 has an entepicondylar foramen and the femur a small third 

 trochanter. The carpus usually has a centrale, and in some 

 living species the tarsus is extraordinarily elongated (Tarsius, 

 Galago, etc.), the elongation implicating the navicular and 



FIG. 328. Chiromys wadagascarensis 

 (from Vogt and Specht). 



FIG. 329. Galago (OtoHcnus] galago 

 (from Vogt and Specht). 



calcaneum. In the pes, digit No. 2 often differs from the others 

 in size and always bears a claw-like nail ; while in the manus, 

 digit No. 2 may be vestigial (Potto). 



The cerebral hemispheres* are relatively small and do not 

 completely cover the cerebellum (except in the Indrisinse).. 

 Their surface is only feebly convoluted, but the calcarine 

 sulcus is indicated. 



* Flower, Trans. Zool Soc., 1863, p. 130. Beddard, P.Z.S. , 1895,. 

 p. 142. Oudemans, Verh. Ak. Amsterdam, 27, 1890. 



