PRIMAT1X 4-05 



inner tubercle quite a diminutive cone. The lower molars are antero- 

 posteriorly elongated like the fourth premolar, each with four tubercles, 

 Initially united into two pairs by a low, oblique, transverse ridge. The 

 last lower molar sometimes bears a posterior heel. The limb-bones re- 

 ferred to Adapis with much probability of correctness, are typically 

 Icinuroid in every respect. The metacarpals and rnetatarsals are re- 

 markably short, while the phalanges are comparatively slender. The 

 typical species, Adapis parisiensis, is known by complete skulls and 

 other remains from the Upper Eocene Gypsum of Montmartre, Paris, 

 and from the contemporaneous Phosphorites of Quercy. Equally complete 

 remains of a larger form, A. magna, with the skull O'l m. in length, are 

 also known from the Phosphorites of Quercy; and more fragmentary 

 specimens of both species have been identified from the Upper Eocene of 

 Egerkingen, Switzerland. Teeth of A. magna also occur in the Upper 

 Eocene of Hordwell, Hampshire. Tomitherium, represented by the man- 

 dible and various limb-bones in the Lower Eocene (Wasatch Formation) 

 of New Mexico, U. S. A., is believed to have been closely related to 

 Adapis. 



FIG. 226. 



Adapts parisiensis; skull and mandible, right lateral aspect, two-thirds nat. 

 size. U. Eocene (Phosphorites); Quercy, France. 



Megaladapis. This is the largest lemur hitherto discovered, and is 

 known only by a skull and mandible from the surface deposits of 

 Madagascar, where the animal seems to have survived until the latter 

 half of the seventeenth century. The skull is unusually elongated ; the 

 orbits are relatively small ; there is a prominent but thickened sagittal 

 crest upon the brain-case ; and the zygomatic arch is comparatively robust. 

 There is no thin plate of bone separating the orbit from the temporal 

 fossa, and the lachrymal foramen opens on the- cheek outside the orbital 

 rim. The incisor and canine teeth are unknown, but the molars and 

 hinder premolars have been observed in both jaws. The upper molars are 

 trituberoular, each bearing two cusps externally and one cusp internally ; 

 while the comparatively small upper premolars 3, 4, exhibit one outer, and 



