GEEGOKY — ON CiENOLESTES 
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3. Food Habits, Examination of three stomach contents reveals 
remains of weevils^ caterpillars, lepidopterous pupa, adult lepidopteran, 
leg fragments of orthopteran, tipulid larva, centipede, spider. Dip- 
terous and lepidopterous remains form the major portion (in one case 
60 per cent). Animals caught in traps showed preference for meat 
bait. Nothing known directly of methods of catching food, but there 
is much anatomical evidence which will be discussed below. 
4. Locomotor habits. Only definite fact of field observation is that 
animals move about freely and are terrestrial, often going through 
runways. Much anatomical evidence. 
5. Protective habits and reactions. No direct testimony. 
6. Breeding habits. Ditto. 
II. HABITUS AND HERITAGE OF THE FOOD-GETTING AND FOOD-REDUCING 
SYSTEMS 
A. Habitus 
The food habitus involves primarily the organs of detection, pre- 
hension, occision, mastication, deglutition, ingestion, digestion, assimi- 
lation, circulation and excretion. It involves secondarily other 
systems, such as the locomotor and the controlling or nervous, ad- 
justing systems. 
Cfjenolestes feeds on insects by means of the following adaptive 
characteristics: 
1. Organs of detection. 
a. Sight poor. Eyes small, orbits small, optic nerves and foramina 
and nerves of eye-muscles all small. 
b. Smell very highly developed. Very large olfactory bulbs and 
tuberculum olfactorium. Chiefly an olfactory brain. Large olfactory 
fossa in braincase and large snout. Expanded olfactory chamber with 
four large ethmoturbinals and one nasoturbinal. 
c. Touch. Sensory vibrissse on snout and cheeks. Very large 
superior maxillary branch of fifth nerve for nose and lips. 
d. Hearing acute. Very large external ears and large inner ear. 
2. Organs of prehension and occision. 
a. Prehension. Orbicularis oris and buccinator muscles well de- 
veloped. Maxillo-labialis or levator muscles of lips rather weak. 
Labrets on upper and lower lips recall those of kangaroos. May be 
used for holding or ejecting food? Tongue long, fleshy, pointed, under 
surface sharply keeled, the keel extending beyond the tip of the tongue, 
fitting into the interspace between the two long anterior incisors. It 
represents the median portion of the sub-lingua (Lonnberg). 
