178 



Proceedings of the Royal Irish Academy. 



" The phosphate of lime of the bone has not been entirely removed 

 by the process of mineralization. There are incrustations of carbon- 

 ate of lime in patches here and there, and it covers debris of quartz 

 which, mth numerous cubic crystals of iron pyrites, permeate the 

 cancellated structure wherever the outer shining vitreous shell has 

 been removed." 



The following portions of the vertebra axe deficient : — The neui'al 

 spine is broken off close to its base ; there is a loss of the right pre- 

 and poii:ion of the left ^josf-zygapophysis, together with a considerable 

 portion of the left half of the centrum. The outKne of the centiiim 

 was evidently ovoid. There is a distinct cavity in front (fig. D), and 

 although about one-half of the posterior aspect is lost, there are clear 

 indications (fig. C), of a similar hollow, thus showing an amphicoelous 

 efviietiu'e. 



[Katural size.) 



It win be obseiwed (fig. A ) that the under surface of the elon- 

 gated centrum is somewhat arched, the anterior portion being di- 

 rected directly forwards, whilst the posterior points downwai'ds and 

 forwards, as indicating an upward neck ciu'vatui'e. The lower border 

 of the centmm has been considerably injured laterally, but clearly it 

 was nari'ow, and not broad and rounded. On its side there is a deep 

 sulcus, pressed inwards. 



The dia- and^;rt>-rt-pophyscs, so pronounced on the vertebrse of CrocO" 



