BCIUltlDiR— KXTIN<3T SPECIES. 



939 



filBiulcr, with the tubercle at the nntorior iiinrgin of the masseteric fowsii iitnlcr 

 the centre of the second molar. The crown of the tootii iins an aiitorior 

 transverse crest and a |»air of posterior tubercles. From the lower Tertiary 

 deposits, Henry's Fork, Wyoming. 



TILLOMYS TARVUS Marsh. 



TWomyt parvui Mahbii, Am-'. Jonrn. Scl. and Arts, M sir. Iv, iH12, 819. 



Considerably smaller than the preceding. Length of lower molar series 

 T.!'""*. Described from a similar imperfect lower-jaw fragm>;nt containing 

 the second molar, from Grizzly Buttcs, Wyoming. 



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