AND AVES OF NORTH AMERICA. 



49 



Present. 



Lost. 



Total 



No. 



Length In. 



No. 



Length In. 

 24 



lengths. 

 24 



68£ 



257.5 



3* 



22.3 



279.8 



14 



55.10 



10 



37.0 



93.4 



21 

 103i 



60.4 



30 



60. 



120.4 



517.0 



In. 



Lin. 



4 



9.2 



3 



8. 



3 



10.2 



2 



9. 



1 



7.5 



1 



6. 



1 



27. 



1 



9.7 



1 



3. 



1 



10.5 



Cranium, 



Cervicals, 



D orso-lumbars, 



Caudals, 



Total, 



This gives the total length to the animal of forty-three feet, two inches, which, increased by the amount taken 

 up by intervertebral cartilages, will give roundly about forty-five feet. Of this, twenty-two feet must be reckoned to 



the neck. 



Measurements. 



The cervical vertebrae from the sixty-sixth to the thirty-ninth are all longer than the dorsals; they commence four 

 inches in length, increase to five, and diminish to four again. 



Length of sixty-third cervical, 



Depth articular face of the centrum, 



Width 



Total elevation ninth do., 



Length ninth caudal, 



Transverse diameter articular face, 



Vertical " articular face do.. 



Length head of rib, 



Width " 

 " 'shaft 

 Many of the ribs preserved have been pressed upon the vertebrae and crushed. 

 The first dorsal is that vertebra which first presents a distinct articulation for a rib. 

 much elevated above the centrum and are longest on the thirteenth (inserting seven supposed to be lost). Their forcn 

 is stout and much depressed, and distally expanded. They diminish gradually, and on the third are represented by a 

 longitudinal, slightly concave articular stirface, somewhat similar to those of the caudals. This surface is bounded 

 above and below by a longitudinal, angulation; the superior is first distinct on the first, and bounds the articular sur- 

 face last on the third. They give the transverse section of the posterior cervicals a pentagonal form; that of the an- 

 terior dorsals is nearly circular. The latter are strongly constricted medially, and the articular faces are slightly con- 

 cave. The external surface near the included angle is coarsely ridged, in conformity with coarse cellular texture of 

 the spongy bone. The venous foramina gradually become more widely separated, approaching each other again on 

 the posterior cervicals. On the dorsals they occupy the bottom of a more or less pronounced concavity. These con- 

 cavities, on the posterior dorsals, are bounded externally by a strong obtuse longitudinal angulation, giving a quad- 

 rate outline to the section of the centrum in this part of the series. 



The posterior cervicals are not readily distinguished from the anterior dorsals. In the latter the ribs appear to be 

 present, of reduced length, judging from the smaller size of the remaining heads. The articular pits continue to de- 

 scend till their lower marginal ridge is the inferior lateral angle of the vertebra. On such vertebras the inferior surface 

 is flat. The neural spines ou dorsals and posterior cervicals are of great height as well as antero-posterior width, and 

 they allow a very narrow interval between them. 



Antero-posterior diameter ?12th dorsal, 

 Transverse diameter articular surface, 

 Vertical do. do., 



Neural canal and spine (latter broken), 

 Length diapophysis 12th dorsal, 

 Width diapophysis at middle, 

 AMERT. PHILOSO. SOC. — VOL. XIV. 13 



The diapophyses are never 



In. 



Lin. 



3 



7.2 



4 



10. 



4 



2.5 



5 



3.5 



4 





1 



10. 



