80 



4 th 



NEURAL SPINE 

 NEURAL ARCH 

 PARAPOPHYSIS 



lOth 



NEURAL ARCH 



NEURAL CANAL 



NOTOCHORDAL 

 CANAL 



HAEMAL CANAL 



PARAPOPHYSIAL 

 STAY 



nth 



NEURAL SPINE 



E PI PLEURAL 



PLEURAL 



U.S. NATIONAL MUSEUM BULLETIN 284 



1st 



NEURAL ARCH 



-NEURAL CANAL 

 NOTOCHORDAL CANAL 



NEURAL 

 PREZYGAPOPHYSIS 



EPIPLEURAL 

 PLEURAL 

 NEURAL SPINE 



EPIPLEURAL 

 PARAPOHYSIS 



NEURAL 

 PREZYGAPOPHYSIS-/: 



CENTRUM ^ 



HAEMAL ARCH 



HAEMAL CANAL 

 HAEMAL SPINE 



15th 



EPIPLEURAL 



HAEMAL 

 PREZYGAPOPHYSIS 



Figure 11. — Entomacrodus nigricans, anterior views of selected vertebrae. 



