176 Annals of the Carnegie Museum. 



mediate tubercles they increase in complexity backward. M^ has a 

 heel composed of one principal tubercle and three smaller ones. Not 

 having access to the types I cannot be certain that this may not belong 

 to some one of the Suida^ described but can find no descriptions that 



correspond to it. 



Measurements. 



Mm. 



From front of I^^ to back of M3 178 



Depth of mandible under M^ 50 



Thickness of mandible under M , 31 



Length of molar-premolar series 126 



Length of premolar Series 48 



Length of molar series 78 



Length of P 2 12 



Width of P,- 9 



Length of P3 16 



Width of P3 12 



Length of P^ 20 ' 



Width of P;i 16 



Length of Mj 23.5 



Width of My 19.5 



Length of Mj 23.5 



Length of Mj • 31 



From Flint Creek beds near New Chicago. 



OREODONTID^. 



Poatrephes paludicola gen. et sp. nov. 

 No. 845. Fig. 18. 



A skull of an Oreodont found in the Flint Creek beds near the vil- 

 lage of New Chicago is different from any other member of the family 

 with which I am acquainted. The principal distinguishing characters 

 are the following : 



Skull elongated, not shortened as in MerycJiyus and Merycoclicerus. 

 Posterior portion of skull including occiput broad, zygomatic arches 

 broad, heavy and spreading anteriorly, mastoid processes greatly ex- 

 panded laterally, tympanic bulla; large but not rounded as in Epo- 

 reodon, external auditory meatus forming a large wedge. Teeth 

 brachy-hypsodont, molars narrow transversely. 



To these may be added with a slight doubt : Large prelachrymal 

 vacuities ; crest of occiput not much overhanging, premaxillaries not 

 coossified. As the skull is somewhat mutilated and distorted I would 



