CONDYLAETHEA. 413 



size of the anterior inner and anterior median cusps, and the greater ante- 

 rior prolongation of the anterior lobe. It differs from its successor much 

 as that of Trnsodon quivirensis does its successor, and resembles the perma- 

 nent fourth premolar of such types {Didelphys, e. g.) in which that tooth 

 resembles the true molars. This specimen shows the anterior cusp of the 

 third and fourth permanent premolars. 



MeastiremenU. 

 No. 1. 



M. 



L,ength of last six superior molars (Pm. iv estimated) 023 



Length of true molars 0112 



Width of base of Pm. ii 0038 



Diameters Pm. iii ^'^"t''"'"!"'^*"'"'' ■•■ 'ff^ 



( transverse 00o2 



Diameters M. ii ^ '^"^•'^"P"^""'"' Zf'- 



c transverse OUoo 



Diameters base of M. iii ^ ='°t""P''«t<'"°'- '^'^'^^ 



( transverse : Wi'^ 



Length of last four inferior molars (M. i estimated) 0175 



Length of base Pm. ii 0040 



T>. i T3 ■ (anteroposterior 0050 



Diameters Pm. iv < ' 



I transverse U03o 



Diameters M. ii ^'^""^™P°«*'^""'^ llf^ 



( transverse 0034 



Diameters M.iii^^'"''^»P''»*''"°'^ l^^'l 



i transverse UU35 



Depth ramus at M. ii 0090 



• No. 2. 



_. , • 1 -J Ki • S anteroposterior 0040 



Diameters superior deciduous M. IV ^ ^ „^,^ 



C transverse (JU40 



_. . 1. -Kr ■ (anteroposterior 0040 



Diameters permanent M. i < ' „.„„ 



( transverse UUbU 



Length base inferior deciduous M. iv 0041 



Length base inferior permanent M. i 0044 



This species is dedicated to my friend, the distinguished zoologist, 

 Prof. Theodore Gill, of Washington. Its horizon is the lower Puerco beds, 

 where it accompanies the Haploconus entoconus. D. Baldwin. 



Anisonchus sectoeius Cope. 



Mioclainus sectorius Cope, American Naturalist, 1881, p. 831 (September 22). Anisonchus sectorius Cope, 

 Paleontological Bulletin No. 33, p. 488, September, 1881. Proceed. Amer. Philos. Soc, 1881, 488. 



Plate XXV c ; figs. 5, 6, and 8. 



This species is known from the maxillary bones with teeth of five indi- 

 viduals ; two accompanied by mandibles with teeth, and by a number of 



