PLATE VI 



Figs. 1,3. P. dioptrica. Lateral and dorsal view of cervical vertebrae. 



Figs. 2, 4. P. phocaena. Lateral and dorsal view of cervical vertebrae. 



Fig. 5. P. dioptrica. Lateral view of rib of last pair. 



Fig. 6. P. phocaena. Lateral view of rib of last pair. 



Fig. 7. P. phocaena. Lateral view of lumbar vertebra (about XII). 



Fig. 8. P. dioptrica. Lateral view of lumbar vertebra (about ? VI). 



