218 



ILLINOIS NATURAL HISTORY SURVEY MANUAL 4 



palatal width. Width of palate between teeth of the two sides of 

 upper jaw, fig. 61c, d. 



palate. Bony roof of the mouth, figs. 61c, d, 119. 



parietal or parietal bone. One of a pair of bones of the brain- 

 case, figs. 117, 118. 



pelage. The hair (fur or wool) covering the body of a mammal. 



placenta. Organ of the developing embryo to provide for its nour- 

 ishment and the elimination of waste products by interchange 

 through the membranes of the uterus of the mother. 



placental. Pertaining to an animal having a placenta. 



plantigrade. Walking on the sole of the foot with the heel touching 

 the ground, as in bears and man. 



posterior. At or toward the hind end ; opposed to anterior. 



postorbital. Area situated behind the eye and usually referring to 

 the postorbital process. 



postorbital process. A projection of the frontal bone directly be- 

 hind the orbit, fig. lZb{p). 



predator. An animal that lives by preying upon other animals. 



prehensile. Adapted for seizing or grasping. 



premaxilla (pi. premaxillae). One of a pair of bones in the skull; 

 these bones, between the nasal and maxillary bones, bear the 

 upper incisor teeth, fig. 117; premaxillary bone, figs. 118, 119. 



premaxillary. Pertaining to the premaxilla. 



premolar. One of a series of teeth on each side of upper jaw and 

 of lower jaw in front of the true molars, figs. 117, 119. When a 

 canine tooth is present, the premolars are between it and the first 

 molar, and in the upper jaw are confined to the maxillary bone. 

 Premolars replace the milk (deciduous) molars. 



process. A prominence or projecting part; an extension. 



protuberant. Bulged beyond the surrounding or adjacent surface. 



retractile. Capable of being drawn back or in, as with the claws of 

 cats. 



rostral. Pertaining to the rostrum or snout. 



rostrum. The projecting front part of the skull, in the snout or 



nose region, figs. 40c-^, 44, 7lc-d, 74-f-i, 117, 118. 

 rudimentary. Not fully developed, or represented only by a ves- 

 tige, 

 sagittal crest. Raised ridge of bone on top of and extending from 



front to back of braincase, fig. 117. 

 scat. A dropping of excrement. 

 septum. A partition. 



Gray 

 Bat 



Keen's 

 Bat 



Eastern 

 Pipistrel 



Red 

 Bat 



