2 IO 
ANIMAL ACTIVITIES . 
alimentary canal, the kidneys, 
and the oviducts empty. 
Con'dyle (Gr. kondylos , knuckle), 
a bony projection. 
Eu sta'chi an Tube, a passage 
from the throat to the ear. 
Fe'mur (Lat. femur, thigh), the 
thigh-bone. 
Fib'u la (Lat. fibula, a clasp), the 
outer of the two bones of the leg 
below the knee. 
Hu'me rus (Lat. humerus , the 
shoulder), the bone of the upper 
part of the arm. 
Keel, in birds, the ridge of bone 
along the ventral side of the ster¬ 
num. 
Met a car'pus (Gr. meta, beyond, 
and carpus'), the group of bones 
between the wrist and fingers. 
Metatar'sus (Gr. meta , and tar¬ 
sus) , the group of bones between 
the tarsus and phalanges. 
O'vi duct (Lat. ovum, egg, and 
duco , to lead), a tube for the 
passage of eggs. 
Pha lanx, pi. phalanges (Gr. pha¬ 
lanx, battle-line or bone of finger 
or toe), one of the finger- or toe- 
bones. 
Ra'dius (Lat. radius), one of the 
bones of the forearm. 
Ret'i na (Lat. rete, a net), the inner 
coat of the eye. 
Reptil'ia (Lat. reptilis, a rep¬ 
tile), a class of vertebrate ani¬ 
mals. 
Shaft, the midrib of a feather. 
Ster'num (Gr. sternon, breast), the 
breast-bone. 
Tar'sus (Gr. tarsos, a flat surface), 
the ankle. 
Ten'don (Lat. tendo, to stretch), 
a cord or band of connective 
tissue usually binding muscles to 
bones. 
Tib'i a (Lat. tibia), one of the bones 
of the leg below the knee. 
Ul na (Lat. ulna, elbow), a bone of 
the forearm. 
U'ro style (Gr. oura, tail, and sty¬ 
los, a column), the long bone at 
the end of the vertebral column 
in the frog. 
Vane, the web of a feather with its 
shaft. 
Ven'tricle (Lat. ventriculus , dim. 
of venter, the belly), a chamber 
of the heart for forcing blood 
into the arteries. 
