GLOSSARY 



219 



skull length. Length of the skull as measured from the posterior- 

 most portion to the anteriormost portion, fig. 118. 



skull width. Width of the skull, usually the width across the zygo- 

 matic arches, fig. 118. 



sonar system. A means of locating objects by producing sound 

 waves and then receiving the reflected vibrations or sound waves. 



supersonic. Pertaining to vibrations and waves whose frequencies 

 are greater than those that affect the human ear. 



supraorbital process. A process on the top rim of each orbit (eye 

 socket), as in fig. 103. 



supraorbital ridge. A lateral, longitudinal ridge of the skull situ- 

 ated above each eye socket. 



suture. A line of union between bones of the skull. 



tarsus. Part of the foot immediately below the long leg bones; the 

 ankle. 



temporal ridge. One of ridges on top of braincase, as in fig. 60a, b. 



tentacle. An elongate, flexible, single or branched process (struc- 

 ture) usually tactile in function. 



thoracic. Pertaining to the chest region. 



tine. Any of the branches which come off the main beam of an 

 antler. 



tooth triangle. Same as enamel triangle. 



tragus. Projection of skin near the bottom of the external ear 

 opening in bats, fig. 51. 



tubercle. A small knotlike prominence either soft or hard. 



underfur. Thick, soft fur lying beneath the longer and coarser hair 

 of a mammal. 



ungulate. Hoofed ; a hoofed animal. 



unicuspid. A tooth with a single cusp, as in certain teeth of shrews, 

 fig. 44a, h, c. 



venter. Abdomen or belly. 



ventral. Pertaining to the lower side, as opposed to dorsal. 



vestigial. Pertaining to a structure or organ that in the adult is 

 degenerate or imperfectly developed. 



v^omer or vomer bone. Bone forming part of the nasal septum 

 (partition) and dividing the nasal cavities. 



vomerine partition. Same as vomer. 



zygomatic arch. An arch of bone forming the outside of each orbit 

 (eye socket), figs. 118, 119. 



zygomatic width. Width of skull across the zygomatic arches at 

 the widest point. 



Evening 

 Bat 



Silver-Haired 

 Bat 



