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THE AMEBIC AN NATURALIST [Vol. XLIV 



Insectivore or even Tamiodont affinities than of Hyamodont de- 

 rivation. They cert,) inly ran not he derived from those of Cyno- 

 hyamodon. — W. D. M.) 



A united scapholunar bone is considered to represent a gi- 

 gantic undescribed Creodont "vielleicht eine Pal ao nidi s odor 

 eine Pachycma." (It does not appear, however, why Dr. 

 Schlosser should suggest Ihe pirsi'iKr of these genera. In 

 Padnjana the scaphoid and lunar were certainly separate, nor is 

 there any evidence nor probability that they were united in 

 Pnhronidis: both genera arc of Lower Kocene age. and belong 

 to families of (Veodonta of which no trace has been found in the 

 Fayum fauna or in th.e Oliuocene epoch. ;md in which the scaph- 

 oid and lunar were never united, so far as we know; on the other 

 hand, we know that the IIy;enod<>nts were represented by several 

 genera in the Fayum and are the only Carnivora positively 

 known in this fauna: they are the only family of Creodonts 

 known to survive into the Oligocene, and in Hycenodon, at least, 

 the scaphoid and lunar were sometimes united. The probabil- 

 ities, therefore, are greatly in favor of this scapholunar repre- 

 senting a large Hyamodont. — W. D. M.) 



The presence of Chiroptera in the fauna is an interesting pos- 

 itive addition. The same degree of certainty does not attach to 

 the Insectivora, since the Proglires with which Metoldobotes is 

 compared are a group of somewhat doubtful boundaries and 

 affinities. If the Fayum irenus is really related to Olbodotcs 

 Osborn (" Oldobctes," Schlosser) it is a point of some interest. 

 Olbodotcs and the almost identical Mi.mdtdis form a charac- 

 teristic group of the Basal Kocene fauna of North America. As 

 Osborn has repeatedly insisted, this fauna was not the source of 

 the later Eocene faunas in North America, except for a few 

 groups like the Phenacodonts. Coryphodonts and I 'intatheres. 

 which gradually disappeared through the course of the Eocene. 

 There is strong support for the hypothesis that it teas the source 

 of the early Tertiary fauna- of South America which developed 



the great Ilolarctic fauna. The aulocht honic element of the 



from this fauna 



