MESODONTA. 213 



out that the dentition differs from that of the known Lemuridce in the more 

 numerous premolars, giving the following formula: I. ?2; C. 1; P. M. 4; 

 M. 3 ; or the same as that of Tomitherimn. 



At the time of the discovery of Anaptomoriyhiis, Prof 0. C. Marsh 

 expressed the opinion* that some of the forms noticed by him in the 

 Bridger formation of Wyoming are allied to the Lemurs. He, however, did 

 not state the characters which led him to entertain this opinion, nor did he 

 give such descriptions as would enable the anatomist to judge of its correct- 

 ness. Up to the present date no more complete account of these animals 

 has appeared. 



The history of discovery of the European forms of this group is simi- 

 lar to that of our own, in respect to the difficulty at first experienced by 

 paleontologists in referring them to their proper systematic position. The 

 investigations conducted by Cuvier during the early part of this century 

 into the extinct Vertebrata of the Eocene of the neighborhood of Paris 

 revealed, among other types, the genus Adapts (Cuv.). This he referred to 

 the Ungulates and to the neighborhood of Anoplotherium. Laurillard and 

 Blainville believed that its affinities were to the Insectivora. The above- 

 mentioned discovery by M. Delfortrie, of Bordeaux, of the greater part of 

 the cranium, at Bebuer (Department of Lot), of his Palceolemur hetilleij-f led 

 him to announce that Lemurs inhabited France during eaidy Tertiary times. 

 This was in confirmation of the opinion of M. Riitimeyer, who had already 

 described a Coenopithecus lemuroides from the Eocene of Switzerland. But 

 MM. Gaudry and Gervais, on further investigation, came to the conclusion 

 that the Palceolemur is the Adapis of Cuvier, and that Aphelotlierium Gerv., 

 and Coenopithecus, are also synonyms of it. And they are disposed to accede 

 to the conclusion of Delfortrie as to its affinities. Subsequently M. Filhol 

 established for this genus, and a new one which he called Necrolemur, a 

 family, the Pachylemuridce, adding a new species, Adapis magnus. In this 

 paper he recognizes the characters pointed out by previous authors as ally- 

 ing this family to the Lemuridce, as well as the higher dental formula which 



* Amer. Jour. Sci. and Arts, Oct. 8, 1872. 



t Actes de la Soci(5t6 Liun<5eiiiie de Bordeaux, xxix, 1673. The separate copies of this paper are 

 'dated May 25, 1873, while a supplement attached to the last page is dated September 4, 1873. 



