45 
anteriorly than posteriorly. The post-zygapophyses pro- 
ject slightly backwards as distinct processes. 
Seventh Vertebra.—One strengthening ridge on each 
side, but slightly cleft into two. Neural spine more com- 
pact and solid. Posterior zygapophyses are now distinct 
tubercles projecting backwards from about the middle of 
the neural arch. The anterior zygapophyses are, as 
hitherto, except in the first 5 or 4 vertebre, triangular 
processes projecting forwards from the base of the neural 
arch. 
Eighth Vertebra (fig. 11)—I'wo moderate and one 
weak strengthening ridge on the eyeless side and three of 
about the same character on ocular side. Posterior 
zygapophyses as in 7. Anterior zygapophyses much 
stronger on eyeless side. Neural spine for the most part 
consists of two hollow tubes placed side by side end con- 
nected by a narrow bridge of bone. 
Ninth Vertebra.—Two well marked strengthening 
ridges and rudiment of another on eyeless side and two on 
ocular side. Zygapophyses getting weaker. Neural arch 
slightly. and neural spme markedly, asymmetrical, but 
the centrum is almost symmetrical with the notochordal 
canal in the centre. 
Tenth Vertebra (fig. 18, V.10)—Two strengthening 
ridges on eyeless side and three on ocular. Zygapophyses 
somewhat reduced, and not much difference between those 
of the two sides. Centrum slightly asymmetrical and 
neural and transverse processes still obviously so, but the 
tendency is now on the wane. The accessory and true 
ribs of this vertebra are the longest of any. Behind both 
decline in length. 
Eleventh Vertebra (fig. 18).—Three strengthening 
ridges on eyeless and two on ocular side. Asymmetry 
slightly less marked than in preceding vertebra. Zygapo- 
