490 Fretp Museum or Naturat History — Zoo.ocy, Vor. XI. 
Deciduous — Periodically shed, not permanent; as, antlers of deer, which fall off 
annually or milk teeth, which are replaced by others. 
Digitigrade — Walking on the toes. 
Diphyodont — Having two successive sets of teeth. 
Discoidal — Disk-shaped. 
Diurnal — Active by day. 
Dorsal — Refers to the back. 
Epidermis — Outer layer of the skin; see skin. 
Epiphysis — A cartilaginous part of a bone which ossifies separately and subse- 
quently becomes anchylosed to the main part of the bone. 
Foramen, pl. foramina — A hole or opening. 
Fossa, pl. fossa — A depression or cavity. 
Fossorial — Burrowing. 
Frugivorous — Fruit eating. 
Hallux — First toe of hind foot; corresponds to big toe in man. 
Heterodont — Having diversified teeth; as, molars, canines, and incisors. 
Hibernate — To become torpid and remain for a certain length of time in a coma- 
tose condition. 
Homonym — One and the same name for two or more different things. 
Hypsodont — Applied to teeth having long crowns and short roots, such as the 
molars of the Bovide. 
Incisors — Front teeth between canines; see chart, p. 12. 
Inguinal — Pertaining to the groin. 
Insectivorous — Insect eating. ; 
Interfemoral — Between the thighs; used with reference to the membrane between 
the hind limbs of a bat. 
Interorbital — Between the eyes. 
Interorbital breadth — Breadth of interorbital constriction. 
Jugal or malar bone — See chart, p. 12. 
Lambdoidal ridge — A ridge on side of back portion of skull. 
Mamma, pl. mammez — A teat. 
Mandible — The lower jaw. 
Mastoid breadth — Distance between mastoid processes. 
Meatus — Used here with reference to the opening of the ear. 
Molars — The back cheek teeth; see chart, p. 11. 
Monophyodont — Having only one set of teeth. 
Nares — The nostrils. 
Nocturnal — Active by night. 
Nomen nudum or anonym — Name originally given to something without an 
accompanying diagnosis or a reference to an identifiable, published figure or 
plate. 
Nucleated — Having a nucleus or nuclear substance. 
Odontoblast — A tooth cell that produces dentine. 
Omnivorous — Eating food of all kinds and indiscriminately. 
Orbit — Eye socket. 
Palatilar length — Distance from posterior end of palatine bone to posterior base of 
incisors. 
Pectoral — Pertaining to the breast. 
Pelage — The hair or fur. 
Pencillated — Refers to tuft of long hairs extending beyond the end of the tail. 
