182 



A NEW FOSSIL PORPOISE FROM MARYLAND. 



Dimensions of Vertebra. 



Measurements, 



Greatest height 



Greatest breadth 



Length of centrum 



Height of centrum 



Breadth of centrum (anterior) . . 

 Height of neural canal (anterior) 



Breadth of neural canal 



Height of neural spine 



Length of transverse process . . . 



Atlas, 



Axis. 



C. 3 



mm. 



C.4 



mm. 



C. 5 



mm. 



mm. 



mm. 



65 



70 



49 







48 



76 



79 



46? 





46+ 



16 1 



19* 



5 



7 



6 



14 



26 



24 



25 



26 







29 4 



28 



[28] 



27 



38 



27 



21 







16 



33 



21 



21 



___ 



24 



5 



16 



2 





3 



16 2 



13 







1 



C.7 



mm. 



51 

 [68] 

 5? 

 25 

 27* 

 18 

 21 



6 



Measurements 



Greatest height 



Greatest breadth 



Length of centrum 



Height of centrum ; 



Breadth of centrum (anterior) . 

 Height of neural canal (anterior) 



Breadth of neural canal 



Height of neural spine . . 

 Greatest diameter of 



mm, I mm 



85 



48+ 

 [72] 



9 

 24 



30 



[26] 



articular facet for 





70 

 14 

 21 

 32 

 | 28 

 22 



31 



tubercle of rib 



Length of transverse process 



13 





Measurements. 



L. - 



(A.) 



L. - 



(B.) 



Greatest height 



Greatest breadth 



Length of centrum 



Height of centrum 



Breadth of centrum (anterior) . . 

 Height of neural canal (anterior) 



Breadth of neural canal 



Height of neural spine 



Length of transverse process .... 

 Breadth of transverse process at 



mm. 



L. - 



(C.) 



mm. 









[39] 

 30 



[32] 

 12 



49? 



[141] 

 39 



30 



33 



mm. 



13 



[39] 

 33 

 36 

 24* 



7 



base 



Ditto at tip 



23 



53 



22 

 12 



21 



13 



mm. 

 92? 



[611 

 17 



23 



31 



30 



24 



34? 



L. - 



(D.) 





mm. 

 123? 



36? 



22 4 



9 



58 6 



13 



mm 

 97 

 64 

 20 

 23 

 29 



31 

 25 



39 





L. - 



(E.) 



mm. 



[39] 



30 



[32] 



30? 



14 



51 



20 

 14? 



16 



L. - 



(F.) 



mm. 

 100 6 



41 

 35 

 34 

 24* 



7 

 44« 



19 



mm. 



[70] 

 24 

 24 



27 



12 



Ca. 1 



(A.) 



mm. 



[40] 



36 



39 



21 4 



5 



mm 

 101 

 59 

 24 

 23 

 28 

 26 

 22 

 45 



mm. 



26 



25? 



12? 



Ca.- 

 (B.) 





mm. 



(C.) 



mm. 



[108] 

 40 

 4P 

 39 



4 





[100] 

 36 



42 7 



37* 



ll 4 



3 



36 



21 

 16? 



29 



Hill 



30 

 26 



[28] 



[18] 



12 

 16 



Ca. - Ca. - 



(D.) 



mm. 



mm 



36 

 26 



27 



14 



Ca.- 



(E.) 



mm. 



[361 [35] 



42* 42 7 



40 4 [421 



8 4 7 4 



2 3 



Chevron Bones 



Three chevron bones have been preserved, which do not differ from those 



One of them (a) is from an anterior caudal and is small, 



recent delphinoids 



larg 



J 



elongated and not deep. Another (c) which belongs farther back is 

 short and deep, with the inferior free margin expanded anteroposterior y 

 projecting backward. The third (b) is intermediate between the other two 



2 From border of anterior articular facet of vertebra. 



> 



1 In median line below. 

 3 Including odontoid. 



* 



Including odontoid. * Posterior. ity- 



Anteroposterior breadth at tip = 32 mm. • The neural spine is a little defective at the extr 



1 Posterior, including facet for chevron. 



