Holland : Crocodile From Montana. 



293 



Pubis. 



Distance from proximal end to distal end 



of posterior margin 78 mm. 287 mm. 



Distance from proximal end to distal end 



of anterior margin 80 " 223 " 



Antero-posterior diameter of proximal end.. 23 " 100 " 



Vertical diameter of proximal end 15 " 55 " 



Smallest antero-posterior diameter of shaft.. 12 " 45 " 



Vertical diameter of shaft 9 " 30 " 



Greatest width at distal end 54 " 200 " 



Vertical diameter at posterior angle of dis- 

 tal margin , 5 " 23 " 



Vertical diameter at anterior angle of distal 



margin 2.5 " io " 



Seventh Dorsal Vertebra. 



Extreme width across transverse processes.. 158 mm. 680 mm. 

 Height from bottom of centrum to top of 



spine 60 " 310 " 



Length across zygapophyses 60 " 180 " 



Last (?) Lumbar Vertebra. 



Extreme width across transverse processes.. 135 mm. 670 mm. 

 Height from bottom of centrum to top of 



spine 83 " 320 " 



Length across zygapophyses 58 " 160 " 



The measurements given in the foregoing comparative table for 

 Crocodilus floridanus yield a total of 1220, from which we obtain a 

 general average of 43.5. The total of the measurements given for 

 Deinosuchus hatcheri is 4617, yielding us a general average of 164.8. 

 The length of the specimen of Crocodilus floridanus from the tip of the 

 nose to the end of the tail, from which the measurements in the first 

 column were derived, is 3050 mm. In the ratio of 43.5 to 164.8 

 we would find that the total length of Deinosuchus hatcheri, provided 

 it was built on the same relative proportions as Crocodilus floridanus, 

 would be 13,830 mm., or about 45 feet in length. 



This method of calculating may be open to objection and the result 

 may be somewhat excessive. We may approach the problem in an- 

 other way. We may assume that the length of the seventh dorsal 

 vertebra represents the average length of the vertebrae in the series. 

 In fact the centra of the caudals about the middle of the tail in all 

 crocodilian skeletons I have examined considerably exceed in length 



