EDENTATA OF THE SANTA CRUZ BEDS. 



319 



MEASUREMENTS. 

 First phalanx, digit V, proximal width .007 Second phalanx, digit V, proximal 



It U 



thick- 

 ness, .oil 



Second phalanx, digit II, length... .024 



" proximal 



width. . . .01 1 

 " " " " proximal 



thickness .015 



Second phalanx, digit III, length... .022 



" proximal 



width ... .013 

 " proximal 



thickness .019 



Second phalanx, digit IV, length . . . .022 

 " " " " proximal 



width . . .008 

 proximal 

 thickness .0135 

 Second phalanx, digit V, length .. .012 



width . . .006 

 " proximal 



thickness .0095 



Ungual, digit II, length 048 



" " " proximal width oio 



" " " " thickness . .016 



Ungual, digit III, length 060 



" " " proximal width ... .016 



" thickness. .034 



Ungual, digit IV, length P.O44 



" " " proximal width oio 



" " thickness. .0145 



Ungual, digit V, length ?.O23 



" " " proximal width 006 



" " " thickness . .010 



Digit II, length 091 



" III, " 094 



" IV, " 085 



" V, " 056 



PELECYODON MAXIMUS Ameghino. 



Pelecyodon maximus Amegh. ; Rev. Argent, de Hist. Nat, T. I, 1891, 



P- 324- 

 Adiasteimis compressidens Amegh. ; fenum. Synopt. des Mamm. Foss. de 



Patagonie, 1894, p. 161. 



The type of this species is a single tooth, which seems not to be distinct 

 from the mandible afterwards described as Adiastemus compressidens, and 

 represents considerably the largest species of the genus. The first lower 

 tooth differs somewhat in size and shape in the two halves of the jaw, that 

 on the right side being somewhat larger and more trihedral, and that on 

 the left more elliptical ; z is very large, broad, antero-posteriorly com- 

 pressed, and 3 is slightly wider ; T is less cylindrical than in the other 

 species and more transversely oval, though placed obliquely to the line of 

 the other teeth. 



The dimensions are from a photograph of the type of A. compres- 

 in the Ameghino collection. 



