1915.] LOWER PLIOCENE SNAKE CREEK BEDS. 85 



laterally and almost quadrangular in cross-section. These are fol- 

 lowed after an intervening space, throughout which the dental 

 margin of the ramus is broken, by a small, single-rooted, conical 



Fig. 10. Genus incert. scd. No. 12091, a fragment of the left ramus of the 

 lower jaw, outer side, two thirds natural size. 



tooth with enamel-covered crown. A second diastema, with un- 

 damaged margin, separates this tooth from the anterior root of a 

 large, evidently deciduous tooth, beneath which, in the jaw, is the 

 cavity for a still larger permanent tooth. The root of ig- seems to 

 have projected into this cavity where it has been truncated by ab- 

 sorption. The symphysis is firmly fused, a small portion of the 

 right ramus adhering to the left one and showing part of the al- 

 veolus for the first incisor of the right side. 



Measurements. 



ij, anteroposterior diameter of alveolus (approximate) 23 



ix, transverse diameter of alveolus (approximate) 18^ 



ia, anteroposterior diameter of alveolus (approximate) GYx 



io, transverse diameter of alveolus (approximate) 9 



i^^, anteroposterior diameter of root 16 



ig, transverse diameter of root 9 



?c, anteroposterior and transverse diameters 6 



