114 CHECK LIST OF THE 



Mesethmoid. Synonym of ethmoid. 



Mesopterygoid. A bone of the suspensorium. 



Metacarpus. The hand proper exclusive of the fingers. 



Metamorphosis. A decided change in form. 



Metapterygoid. A bone of the suspensorium, or chain supporting the 



lower jaw. 

 Metatarsus. The foot proper. 



Molars. The grinding teeth ; posterior teeth in the jaw. 

 Monogamous. Pairing ; said of birds. 

 Muciferous. Producing or containing mucus. 

 Myocomma. A muscular band. 

 Myodome. Cavity under the brain for the reception of the rectus muscles 



of the eye. 



N. 



Nape. Upper part of neck, next to the occiput. 



Nares. Nostrils, anterior and posterior. 



Nasal. Pertaining to the nostrils. 



Nasal plate. Plate in which the nostrils are inserted. 



Neural arch. An opening through the base of the neural spine, for the 



passage of the spinal cord. 

 Neural canal. The neural arches as a whole. 

 Neural processes. Two plates rising vertically, one on each side of the 



centrum of the vertebra, which unite toward their ends and form 



a spine. 

 Neural spine. The uppermost spine of a vertebra. 

 Nictitating membrane. The third or inner eyelid, of birds, sharks, etc. 

 Notochord. A cellular cord, which in the embryo precedes the vertebral 



column. 

 Nucha. The upper part of the hind neck, next the hind head. 

 Nuchal. Pertaining to the nape or nucha. 



O. 



Obscure. Scarcely visible. 



Obsolete. Faintly marked ; scarcely evident. 



Obtuse. Blunt. 



Occipital. Pertaining to the occiput. 



Occipital condyle. That part of the occipital bone modified to articulate 



with the atlas. 

 Occipital plates. Plates on the head of a serpent, behind the vertical plate. 

 Occiput. Back of the head. 

 Ocellate. With eye-like spots, generally roundish and with a lighter 



border. 



