6 Watson, TJic Sauroptcrygia of tJic WJiitby Muscuin. 



The posterior edge of the spine lies some '5 cm. 

 behind the posterior surface of the centrum, and the 

 posterior zygapophyses project about V2^ cm. behind the 

 centrum. 



23rd Cervical. The posterior cervicals differ from the 

 anterior ones in the following ways : — 



1. The arch is not nearly so high, relatively, to* the 

 general size of the bone. 



2. The neural spine is placed a good deal further 

 back ; it is also proportionally rather larger in all ways. 



3. The only visible rib facet is higher on the centrum, 

 being touched by the neuro-central suture. 



The dimensions of the 23rd cervical are : — 



Maximum width of centrum 



Maximum length of centrum 



From lowest point of neuro-central suture 



to top of anterior zygapophysis 

 Overall length 



Breadth across zygapophyses 

 Minimum breadth across zygapophyses... 



Minimum antero-posterior length of pedi- 

 cels 



Height of spine (24th) 



Breadth of spine ... ... ... ... 2 „ 



Overlap of zygapophyses .. . ... ... 37 „ 



The Pectoral vertebrae are not well exposed. They 

 shew a gradual change from the cervicals to the dorsals. 



The centra of the Dorsals are entirely concealed, but 

 the neural spines and transverse processes are well shewn. 



The 14th dorsal (the 42nd of the entire series) has a 

 neural spine 7 cms. high above the anterior z}'gapophyses, 

 2'5 cms, long at the bottom, and 3-5 cms. at the top ; it 

 appears to be of nearly circular transverse section. 



The z}'gapophyses, which are not well displayed, are 



