ANATOMICAL SOCIETY OF GREAT BRITAIN AND IRELAND. 



IX 



further illustrations of irregularity in the ossification of the cranial 

 vault. 



(2) Professor Patbrson showed the skeleton of a full-time hydro- 

 cephalic foetus, with an additional pra^sacral (cervical) vertebra. The 



Fig. 2.— Vertebral Column, with aelditional Pra^sacral Vertebra (cervical), 



A. M. P. 



skeleton was mounted, more for the sake of the head than the other 

 parts. The sternum was removed separately, so that one is sure of its 

 condition in the fresh state. 

 The vertebral formula is 



C. 8, T. 12, L. 5, S. 5, Co (cart.). 



The chief peculiarity lies in the condition at the upper end of the 

 thoracic region. On the right side the eighth vertebra bears a rib with 



