16 



PLEISTOCENE MAMMALIA. 



much larger tooth, resembling the permanent molars. It is divided by a deep 

 transverse valley into anterior and posterior sections, each of which in the unworn 

 tooth is bicuspid. There are four strong roots. The enamel of the worn tooth 

 shows a kind of trefoil as in the adult molars. 



Milk Dentition of the Lower Jaw. 



The milk-mcisors and canines are very small conical teeth, much like those of 

 the upper jaw. Dm. 1 is unrepresented unless the tooth here regarded as pm. 1 

 is really dm. 1. 



Dm. 2 is a simple conical tooth, with a rectangular outline. When unworn it 

 may have two minute cusps placed behind the principal cone. The roots diverge 

 strongly. 



Dm. 3 is bigger and has a large anterior cone preceded by a small cusp and 

 divided by a deep furrow from a bilobed posterior cone. There is a fairly well- 

 marked cingulum, and two roots are present behind and one in front. 



Dm. i is a larger tooth with three large bifid cones divided from one another 

 by deep grooves. Slight cusps occur in front of the first cone and larger cusps 

 behind the third. There are a single anterior and two posterior roots. 



Measurements of Certain Permanent Teeth. 











•5 o 



£ 5 



£ ic 





o 

 S . 



3 



o 



3 t£ 





;■ M 





s = 

 n't* 



- 01 



1 in Roy. i ' 

 Mus. 



tooth, iwifl 

 11. of Bur 



S 5 



^_ '_ 

 c r 



c - ~ 



£ :i 



-- s 



a So 



5 e - 





3~ 



to r. 



«, o 



. -* K 



i i a 





Si* 



o 



2 a 



So 









~ *£ 



a i c 



5 > ! 





ti.E.1: 







m a 





-ui 



s = — 





/. — 



1. S. 



SrtS 



-too - 



MPP s 



Length of C 









300* 



Length of I. 1 





... 







37*5 



Length of extra-alveolar portion of I. 1 



:so-2r, 



2.V4 



84-5 



27-4S 



Tin 



Length of C. measured along anterior curvature 



Length of extra-alveolar portion of C" 



215 



ST,.", 



259 

 9-4 





404* 

 6-4 





Length of extra- alveolar portion of I. 2 





* Measured along anterior curvature. 



