PI ATE iX XII. 



Figs. 1- 6. Thoracic ftrtebrx, anterior aspect. 



Figs. 7-12. Thoracic vertebra, posterior aipn t. Hgs. 1 and 3, first; figs. 2 and 8, third; 

 figs. 3 and 9, fourth; figs. 4 and 10, fifth; figs. 5 and 1 1 *f*nthj figs. 6 and 12, sixth. 

 About seven-tenths natural size. 



