SYNOPSIS OF THE VKKTEBUATE FAUXA OF THE PUERCO SEUIBS. 319 



The mandibular ramus is slender and moderatclj^ stout, especially so at the ante- 

 rior base of the eoronoid process. It follows that the anterior border of the masseteric 

 fossa is well marked, but there is no distinct inferior border. The angle is prominent, 

 straight, and compressed; apex lost. The dental foramen is below the middle of the 

 base of the eoronoid; and in lino with the alveolar border. The symphyseal surface 

 is smooth. The fourth premolar is close to the canine, and to the third, and has one 

 root. Premolars all closely contiguous. From the appearance of the alveoli the last 

 infei-ioi- molar is of reduced size. Enamel everywhere smooth. 



Measurements ; from one individual. M. 



Length of posterior five molars 031 



" " true molars 0155 



(anteroposterior 005 

 vertical, outside 004 

 tjansverse 006 



(anteroposterior 0055 

 vertical, iusiile 005 

 transverse 0075 



(anteroposterior 0043 

 vertical, inside 0043 

 transverse 006 



Length of inferior molar scries 041 



" " true molar series 031 



( anteroposterior 007 



Diameters m. ii < „„,_ 



i transverse ou4o 



Depth ramus at m. iii 015 



p. m. iii 014 



anteroposterior 016 



transverse Oil 



anteroposterior 013 



transverse 009 



Diameters glenoid cavity of scapula 

 Diameters peduncle of ilium 



( anteroposterior 031 



Greatest diameters of astragalus < „,_ 



^transverse 017 



Width of trochlea 0135 



" head Oil 



Length of cuboid 012 



The specimens are all from the lowest beds of the Puerco. 



MIOCLiENUS Cope. 

 I'roc. Amer. Phil. Soc, 1881, p. 489; 1883, p. 547 ; Tertiary Vertebrata, 1885, p. 334. 



An examination of my material of species allied to the types of this genus results 

 in the following conclusions : 



The fifth or anterior inner cusp of the inferior molars in this genus, displays 

 various conditions of development down to absence. In the species which I formerly 



A. p. S. VOL. XVL 2o. 



