288 The Mammals of Colorado 
Humerus, the upper bone of the fore hmb. 
Hypsodont, having long crowns and short roots, applied to such 
teeth as the molars of the BovidcB. 
Incisors, the teeth in the front part of the mouth, always in front of 
the canines when the latter are present. 
Incisiform, having a cutting shape or form. 
Interfemoral, between the thighs, used with reference to that part 
of the wing membrane of a bat which is between the two 
hind legs. 
Interorbital, between the eyes or orbits. 
Lamhdoidal ridge, the ridge extending around the upper part of the 
back of the skull of a mammal; not always well-developed. 
Mandible, the lower jaw. 
Mastoid capsules, the outer posterior portion of the mastoid, in 
some mammals considerably inflated. 
Meatus, an opening, in this book used exclusively with reference to 
the ear, sometimes spoken of as the auditory meatus. 
Molariform, having the shape or form of a molar. 
Molars, the grinding teeth, always in the back of the mouth. 
Nares (plural), the nostrils. 
Nocturnal, active by night. 
Omnivorous, eating or living on any sort of food. 
Orbit, the eye socket. 
Pelage, the hair or fur of a mammal, used in the same sense as 
the plumage of a bird. 
Pencilled, pencillated, referring to the tail ending in a distinct 
tuft of longer hairs. 
Phalanges, the bones of the fingers or toes. 
Plantigrade, walking on the whole sole of the foot. 
Pollex, the thumb or first toe of front foot. 
Postauricular, behind the ear. 
Postorbital, behind the orbit or eye, especially those processes of the 
skull which lie or project back of the eye. 
Premolar, a tooth in the permanent dentition which replaces the 
milk molar. 
Radius, the outer of the two bones of the fore leg. 
Ramus, pi. rami, the ascending branch of the lower jaw. 
Reentrant, used especially with reference to the angles on the 
sides of the molars of certain rodents, and which extend into 
the body of the tooth. 
Retractile, capable of being drawn back or in, as the claws of a cat. 
Rostrum, that part of the skull anterior to the eyes, practically 
the nose. 
Sagittal crest, a ridge or crest on the upper surface of the brain-case 
of a mammal ; not always present. 
