Loomis — Wasatch and Wind Rive?' Primates 277 



Art. XXII. — Wasatch and Wind River Primates ; by 



F. B. Loomis. 



The Amherst College expedition of 1904 made a considerable 

 collection of Primates from the Wasatch and Wind River 

 beds, especially from the latter, which are the basis of the fol- 

 lowing study, supplemented by reference to other collections 

 from the same horizons. 



Anaptomorphidae Cope. 



The genus Anaptomorphus was established by Cope when 

 he described the Bridger species, A. aemulus* known by a 

 single but nearly complete lower jaw. In 1882 the Wasatch 

 species, A. homunculus, was added to the genus,f bqing an 

 unusually complete skull. Later, lower jaws were found, and 

 the lower dentition mostly made out. The type species has but 

 eight teeth in the lower jaw, the formula being if c| pmf mf ; 

 while the lower jaw of A. homunculus is not so much shortened, 

 having apparently nine teeth in the series, making a formula if 

 cipmf m-|4 Then while in A. aemulus the paraconid is want- 

 ing, in A. homunculus it is present though reduced. These two 

 marked differences led Wortman to suggest§ that these two 

 species should be placed in different genera, but for lack of 

 more abundant material, he did not propose a new one. 



In the Wasatch the Amherst expedition found one new 

 Anaptomorphus, little over half the size of A. homunculus ; 

 and nine specimens of a second new species in the Wind River 

 beds. While these do not add to our knowledge of the generic 

 features, their rarity and the interest in American Primates 

 seems to require their description. They are both closely related 

 to A. homunculus and should a new generic name be proposed 

 would go along with that species. 



The affinities of the family seem to the writer to be with 

 the modern Tarsius, as pointed out by Cope (Tertiary Yert. 

 1884, p. 246) and Wortman. The latter authority has pro- 

 posed the following classification of Pri mates, | which is adopted 

 in this paper. 



* Proc. Amer. Phil. Soc. Phila., 1872, p. 554. 



fProc. Amer. Phil. Soc. Phila., 1882, p. 152. 



% See Osborn, Bull. Amer. Mus. Nat. Hist., vol, xvi, 1902, p. 200. 



§ This Journal, 1904, p. 213. 



|| This Journal, 1904, p. 213. 



Am. Jour. Sci. — Fourth Series, Vol. XXI, No. 124. — April, 1906. 

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