174 



A NEW FOSSIL PORPOISE FROM MARYLAND 



Measurements of Teeth (Cont). 





Measurements 



Upper. 



Right, in situ. 



1 



2 



Total length 

 Length of crown 



Greatest diameter of crown at 



mm. 



6.8 



base 



Greatest diameter of root 



Least diameter of root at extrem- 



4.2 

 4.1 



ity 



mm. 



7.6 



5.1 

 5.1 



3 



mm 



8.7 



5.4 

 5.2 



Right, detached. 



mm. 

 26.0 1 

 10.0 



5.2 

 5.4 



mm, 

 26.4 

 11.4 



5.3 

 5.5 



2.1» 1.8 



3 



mm. 

 24.9 1 

 10.7 



4 



5 



6 



mm. 

 24.5 1 

 11.0 



5.3 

 5.5 



5.4 

 5.7 



2.1 1 2.0 1 



7 



8 



mm. mm. 



17.9 3 

 10.9 



5.3 



5.8 



20.7 2 

 9.3 



mm. 

 13.1» 

 10.6 



4.7 

 5.3 



5.5 



mm. 

 14.P 



8.8 



4.2 



Measurements of Teeth (Cont.). 



• 



- 











Lower. 











* 



Measurements. 



Left, in situ. 



• 



mm. 

 25. 8 1 



8.4 



5.6 

 5.5 



2.31 





Left, detached. 









1 



2 



mm. 



8.0 



5.2 

 5.? 



« 



3 



4 1 



mm. 



9.3 



5.5 



5 



6 



mm. 



22.4 2 



11.8 



5.2 

 5.6 



7 



Total length 



Lacking. 



mm. 



26.9 



8.5 



5.4 

 5.5 



1.8 



mm. 

 19.9* 

 8.8 



5.3 

 5.4 



mm. 

 24. 5 2 

 10.0 



5.3 



5.8 



mm. 

 19.3 2 



Length of crown 



11.0 



Greatest diamer of crown at 

 base 



5.0 



Greatest diameter of root . . 

 Least diameter of root of ex- 



5.5 



Measurements of Teeth (Cont.). 



Lower. 



Measurements. 



Right, in situ. 



1 



2 



Total length 

 Length of crown 



Greatest diameter of crown 



at base 



Greatest diameter of root . 

 Least diameter of extrem- 



mm 



7.0 



4.7 

 4.6 



mm. 



4 



8 



8.2 



4.9 



4.8 



mm. 



8.4 



5.1 

 5.1 



mm. 



8.9 



5.3 

 5.3 





mm. 



9.0 



5.6 

 5.5 



9 



mm 



9.6 



5.5 

 5.3 



10 



Bight, detached 



1 



mm 



9.6 



5.5 

 5.2 



mm. 

 27.6 1 



2 



9.5 



5.4 

 5.8 



2.5 1 



mm. 

 22.9 2 

 10.9 



5.4 

 5.5 



3 



4 



mm. 

 18.5 8 

 10.9 



5.6 

 5.4 



mm. 



21 J 2 



9.9 



5.0 

 5.0 



5 



mm. 

 22.2 2 

 11.7 



5.0 

 5.7 





them which may take place hereafter. Teethnot marked defective are complete, 

 but only a few dimensions of those in situ can, of course, be given. The measure- 

 ments of the diameter of the root in the latter are probably rather too small, as 

 the largest diameter usually lies below the level of the margin of the jaw. 



Earbones. 



The left periotic bone, and the larger part of the right tympanic bone have 



been preserved 



Tympanic (PL XXV, figs. 12, 13) 

 comprises the inner and lower surfaces. It is 34 mm. long and 16 mm 



rved 



The portion of the tympanic preserve 

 T4. :„ 04 1 n „A ifi mm. broad 



