330 



must be considered a congenital 

 condition. The formula is C. 7, 

 T. 13, L. 6, S. 5, C. 3. The bones 

 were very friable. I regret that 

 the 7th cervical was so injured 

 that it is impossible to say whether 

 there was or not a free costal ele- 

 ment on the left. Certainly there 

 was no facet for the head of a rib. 

 The most there can have been was 

 the continued separation of a costal 

 element. The right had no free 

 element. This spine is numbered 

 297. 



Class IV consists of spines 

 in which there is a tendency to 

 diminution of the number of prae- 

 sacral vertebrae. In Group A. 

 there are 2 spines with more or 

 less fusion and incomplete develop- 

 ment of vertebrae. Group B con- 

 sists of one spine in which the 

 atlas is fused with the occiput. 

 Group C consists of a spine which 



Fig. 1. 297. 



Fig. 2. H-3. 



