PEECEEDIXGS OF THE NATIONAL MUSEUM 



VOL. 66 



136). Darke County is covered ^Yitll Wisconsin drift. The animal 

 lived, therefore, after the last ice sheet had withdrawn from the- 

 locality. The tooth lacks little of being as complete as it was at the 

 death of the animal. Apparently one ridge-plate, possibly two, are 

 missing in front, and one or two are gone from the rear. Twenty- 

 one and a half are present. Nine are crossed by a 100 mm. line. 

 The enamel is thin. The pulp cavity was large and the transverse 

 ridges formed by the meeting of the enamel of two contiguous ridge- 

 plates are in view. The original length of the base was close to 

 260 mm. The height near the front and perpendicular to the base 

 is 154 mm. The greatest thickness is 103 mm. 



4. TEETH OF ELEPHAS ROOSEVELTI FOUND IN INDIANA 



Prof. H. F, Osborn ^ described and figured teeth of an elephant 

 found in Indiana which he referred to Elephas jnimigenius. His fig- 

 ure is here reproduced. Calculated from the figure, the length of the 



' S 5 4 3 2 1 



Tooth axd part of the skull eefeeked by Osboen to EfLEPHAS peimigenius. X.25 



hindmost molar from the base in front to the middle of the hinder 

 plate is about 255 mm. ; the height at the middle of the length close 

 to 120 mm.; the width of the grinding surface only about 65 mm. 

 It is thus very narrow, but doubtless on further wear it would in- 

 crease in wadth. Osborn states that 13 ridge-plates are compressed 

 into 100 mm. space. There is an error somewhere. The writer esti- 

 mates that there are only 10 plates in 100 mm. Indeed, on an aver- 

 age, there appear to be only 9 in this distance. In this Indiana 

 specimen, after it w^as worn on 8 plates, the unworn grinding border 



^ Amer. Mus. Novitates, No. 41, p. 8, fig. 8, 



