GLOSSARY 217 



infraorbital foramen. A small opening or pore in the skull in front 



of, or anterior to, and usually slightly below the eye socket, fig. 



117 (dark area above the third premolar of upper jaw). 

 infraorbital plate. Also called zygomatic plate ; expanded anterior 



or front portion of the zygomatic arch, fig. 117. 

 insectivore. A mammal belonging to the order Insectivora (shrews 



and moles). 

 insectivorous. Insect eating. 



interorbital region. Area between orbits or eye sockets in the skull. 

 interorbital space. Area across skull at the widest part of frontal 



bone. 

 interparietal or interparietal bone. Part of the top of the brain- 

 case; bone at the rear of the skull with the front extension 



wedged between the parietal bones, fig. 118. 

 lacrimal or lacrimal bone. Small bone at anterior (front) angle 



of eye socket. 

 lateral or laterally. Pertaining to the sides of an animal. 

 longitudinal or longitudinally. Lengthwise, along the long axis of 



an animal. 

 mandible. One of the halves of the lower jaw, fig. 117. 

 marsupial. Mammal belonging to the order Marsupialia; pertaining 



to an animal having a pouch for carrying the young. 

 maxilla (pi. maxillae) or maxillary bone. One of a pair of bones 



that bear the molar and premolar teeth, figs. 117, 118. 

 maxillary. Pertaining to the maxilla; maxillary bone. 

 melanistic. Black or blackish, having more than the normal amount 



of dark pigment. 

 metatarsal gland. A gland situated on the inside of the hind leg 



between the toes and the heel. 

 milk tooth. A temporary (deciduous) tooth; "baby" tooth. 

 molar or molar tooth. One of the posteriormost or back teeth 



of the upper or the lower jaw, figs. 7Aa-e, 117, 119. 

 molar tooth row. The group or row of molar teeth. 

 nares. Bones of the nose. 

 narial aperture. Internal nares; nasal opening through the roof of 



the mouth, fig. 118. 

 nasal or nasal bone. One of a pair of bones in the region of the 



nose, figs. 117, 118. 

 nosepad. The bare part of the nose of a mammal, 

 occipital or occipital bone. Pertaining to, or one of, the bones 



which surround the foramen magnum (large opening) at the 



posterior (rear) end of the skull, fig. 119. 

 ochraceous (ocherous). Pertaining to a color si.milar to ocher ; 



referring to a yellowish or yellowish tan color, 

 omnivorous. Eating both animal and vegetable food. 

 orbit. Socket in the skull in which one of the eyes is located. 

 orbital region. Pertaining to the area near one of the orbits or eye 



sockets or between the eye sockets. 

 over-all length. Measurement from tip of the nose to tip of the 



tail, excluding terminal hairs; total length. 



