240 BULLETIN 16 9, UNITED STATES NATIONAL MUSEUM 



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Figure 6i.—Litaletes disjunctus Simpson: a, U.S.N.M. no. 9281, 

 right P4-M3, crowTi view; 6, U.S.N.M. no. 9323, right lower 

 jaw, external view; c, U.S.N.M. no. 9338, right lower jaw, 

 internal view. Twice natural size. 



:Figure 65.—LUaletes disjunctus Simpson, U.S.N.M. no. 9324, 

 right upper jaw: a, E.xternal view; 6, crown view. Throe 

 times natural size. 



The lower canine is a 

 small but tall, erect, spat- 

 ulate tooth. Pi is low, 

 l-rooted, with a minute 

 heel. P2-3 are more ad- 

 vanced than in Ellipsodon 

 in that each has a distinct 

 paraconid. The heel is, 

 how^ever, relatively short, 

 and only half its v/idth is 

 formed by the incipient 

 basin. The anterior blade 

 of the protocone is dis- 

 tinctively modified into 

 a sort of shearing crest. 



The lower molars close- 

 ly resemble those oi Ellip- 

 sodon aquilonius, but Mi 

 has trigonid and talonid 

 of nearly equal width, 

 M2 has trigonid generally 

 markedly wider, and M3 

 is less reduced. 



U.S.N.M. no. 6179 from 

 Log. 51, includes an M2 

 morphologically 3ompa- 

 rable to this species and 

 measuring 4.7 by 3.9 mm, 

 near the means for the 

 Gidley Quarry specimens. 

 There is, however, an 

 upper jaw with M^"^ from 

 the same locality, dimen- 

 sions given in table 53, 

 that is morphologically 

 very close to this spe- 

 cies but notably smaller 

 than the available Gid- 

 ley Quarry specimens. 

 Since, however, these are 

 only two in number it 

 cannot be assumed that 

 a real difference exists. 

 The greatest relative dif- 

 ference, in length of M^ 



