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preserved show the concavo-convex form of their articular extremities, which 

 are adapted to corresponding modifications of the articular diapophyses. 



Purchased. 



610. A vertically bisected abdominal vertebra of a Python, showing the texture of 

 the centrum and neural arch, the oblique position of the articular ball and 

 cup, and the longitudinal ridge at the side of the neural canal. The compact 

 tissue is here seen to be thickest at the fore part of the neural spine and at 

 the under part of the centrum. Presented by Prof. Owen, F.R.8. 



611. A horizontally bisected abdominal vertebra of a Python, showing the thick, 

 compact tissue at the sides of the centrum, the thin layer of the same at its 

 articular ends, the small medullary cavity in the middle, and the cancellous 

 texture which forms the chief part of its substance. The medullary cavity 

 communicates with the vascular canals which lead to the two foramina on the 

 upper and the two on the under surface of the centrum. 



Presented by Prof. Owen, F.R.S. 



612. The neural arch, removed by horizontal section from the centrum, showing the 



small medullary cavity in each neurapophysis which communicates with a 



vascular canal opening into the zygantruin. 



Presented by Prof. Owen, F.R.S. 



613. Two pleurapophyses or vertebral ribs of the right side of a Python, showing 



their oblong articular surface, concave above and almost flat below, with a 

 tubercle developed from the upper part and a rough surface excavated on the 

 fore part of the expanded head for the insertion of the precostal ligament. 



Purchased. 



614. A rib of a Python which has been fractured near its distal end and united. 



Purchased. 



615. A rib of a Python which has been fractured near its middle and united. 



Purchased. 



