206 



CARINAT.E. 



A. 30. Cast of a fragment of the right ramus of the mandible, showing 

 the imperfect dental alveoli. 



A. 21. Cast of the axis vertebra. Original figured by Marsh in his 

 'Odontornithes,' pi. iii. fig. 1. 



A. 22. Cast of fourth cervical vertebra. Original figured by Marsh, 

 up. cit. pi. iii. fig. 3. 



Vm. 4S. 



Hcsperornis rcgalis. — Anterior (A) aud postei-ior (B) aspects of tlie thirteenth 

 cervical vertebra ; from the Cretaceous of Kansas. \ . s, neural spine ; s, 

 prezygapophysis ; s, postzygaj)Opliysi8 ; d, upper transverse process (dia- 

 popbysis) ; ;j, lower transverse process (parapophysis) ; n.c, neural caual ; 

 f, costal canal. {After Marsh.) 



A. 23. Cast of the twelfth cervical vertebra. Original figured by 

 Marsh, op. cit. pi. iv. fig. 3. A figure of the thirteenth 

 cervical is given in woodcut (fig. 48). 



A. 24. Cast of the fifteenth cervical vertebra. Original figured by 

 Marsh, oj). cit. pi. iv. fig. 6. 



A. 25. Cast of the first dorsal vertebra. Original figured by Marsh, 

 op. cit. pi. iv. fig. 7, where it is reckoned as the sixteenth 

 cervical. 



A. 27. Cast of the fifth dorsal vertebra. Original figured by Marsh, 

 op. cit, pi. V. fig. 4, where it is reckoned as the third 

 dorsal. 



A. 26. Cast of the eighth dorsal vertebra. Original figured by Marsh, 

 op. cit. pi. V. fig. 7, as the sixth dorsal. 



