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Maxillary. A bone of the upper jaw lying behind the premaxillary of 

 each side, usually bearing the outermost row of teeth ; missing in 

 Siren and Necturus. 



Metamorphosis. Transformation ; change from tadpole to adult form. 



Nuchal Plate. See figure 11. 



Occipital. Belonging to the hinder part of the head. See figure 9. 



OcELLATED, Fumished with eye-like spots, spots consisting of concen- 

 tric rings. 



Olive. Brownish or yellowish green. 



Opisthoccelous. Said of vertebrae which are concave at the hinder 

 end and convex at the anterior end. 



■Oviparous. Producing young from eggs that hatch after deposition. 



Ovoposition. The laying of eggs. 



OvoviviPAROus. Producing young from eggs which hatch before being 

 laid. 



Palatine. A bone of the roof of the mouth lying behind the vomer 

 on each side. 



Palatopterygoid. The united palatine and pterygoid. 



Papilla. Minute folds or elevations of the skin or mucous membrane. 



Parasphenoid. a broad bone underlying the brain-case; parasphe- 

 noidal teeth are found in the hinder part of the roof of the mouth. 



Paratoid. Belonging to the region found at the hinder lateral part of 

 the head ; paratoid glands of toads are elevated glandular bodies at 

 the sides of the back part of the head. 



Pectorals (of tortoises). See figure 12. 



Plnnate. Arranged along the sides of a central axis like the vane of a 

 feather. 



Plastron. The lower portion of the shell of a tortoise. 



Pleurodont. With the teeth grown fast to the inner side of the bone 

 of the jaw. 



PosT-FRONTALS. See figure 9. 



Prefrontals. See figure 9. 



Premaxillary. The bone forming that part of the upper jaw immedi- 

 ately at the snout. The two premaxillaries are sometimes united. 



Proccelous. Said of vertebrae which have the anterior end concave, the 

 hinder convex. 



Pterygoid. A bone of the roof of the mouth lying on each side imme- 

 diately behind the palatine. 



^Quadrate. The bone on each side to which the lower jaw of batrach- 

 ians and reptiles is swung. 



JRostkal. The epidermal plate covering the snout of snakes and lizards. 

 See figure 9. 



