NEW PALEOCElSrE MAMMALS SIMPSON 231 



Family MIXODECTIDAE 



The following genus is so distinctive that it may not belong in this 

 family, but it compares more nearly with Alixodectes, Cynodontomys, 

 and their respective allies than with other genera known to me. 



EUDAEMONEMA,22 new genus 



Type. — Eudaemonema cuspidata, new species. 



Distribution. — Middle Paleocene, Fort Union, Mont. 



Diagnosis. — Dental formula 2TT3" Median incisor much enlarged. 

 Canine reduced, but larger than lateral incisor or Pi. Pi-o small, one 

 rooted. P4 submolariform, comparable with Cynodontomys, with 

 distinct paraconid, large, high metaconid, and basined, tricuspid 

 talonid. Molar structm-e nearly as in Mixodectes (or Indrodon) but 

 trigonids more elevated and all six cusps sharper and more distinct. 



EUDAEMONEMA CUSPIDATA," new species 



Type.— v. S.N. M. no. 9314, left lower jaw with C, P2-M3, and roots 

 or alveoli of all other teeth. Found by Dr. J. W. Gidley. 



Horizon and locality. — Gidley Quarry (and one specimen from 

 Silberling Quarry), Fort Union, Middle Paleocene horizon, Crazy 

 Mountain Field, Mont. 



Diagnosis. — Sole known species of genus as defined above. M1-3 

 (type) 10.9 mm. 



Order PRIMATES 



Dr. Gidley (1923, op. cit.) pubHshed thorough descriptions of the 

 Fort Union Primates, and this is the only part of his projected memoir 

 that can be considered as definitively complete J by him. The rapid 

 advances in knowledge during the past 12 years, nevertheless, neces- 

 sitate reconsideration of his conclusions. These do not affect taxon- 

 omy, the sole concern of this paper, except in requiring the generic 

 separation of one of Gidley's species. Gidley foresaw that this species 

 was probably generically distinct, but with proper conservatism did 

 not give a name that would require fuller validation by later research. 

 The family position of these primate genera is dubious and requires 

 more detailed discussion than can be given here. 



PALENOCHTHA,24 new genus 



Type. — Palaechthon minor Gidley, 1923. 



Distribution. — Middle Paleocene, Fort Union, Mont. 



?. ?. ?. 3. 

 Diagnosis. — Dental formula probably . . ^ 3 * Anterior lower 



dentition shorter than in Paromomys or Palaechthon and apparently 



^ 'EiiSainovrjiJux, a piece of good fortune. Analogous with Olbodotes ("bearer of bliss"). 



*^ Cuspidata, cuspidate. I borrow the name from a label by Gidley, "Indrodon or new genus, cuspidatus" , 

 on a specimen probably of this species. There is no manuscript by him definitely referring to this form. 

 The specimens referred to this species are highly variable — Gidley's labels suggest that he was inclined to 

 place them in several different genera and species— but they seem not to be clearly separable specifically. 



** Anagram of Palaechthon. 



