GLOSSARY. 15 



Basihy'al (L. basis, the base ; hyoides, hyoid bone). An ossi- 

 fication of each corner of the hyoidean arch occurring in 

 some fishes ; represented in Human Anatomy by the body 

 of the hyoid bone. 



Basioccip'ital (L. basis, a pedestal, base ; occiput, the back of 

 the head). A bone of the skull which in Human Anatomy 

 is represented by the basilar process of the occipital bone. 



Basiophthal'mite (Gr. basis, a pedestal ; ophthalmos, the eye). 

 The proximal joint of the eye-stalks in the Crustacea. 



BasFpodite (Gr. basis, a pedestal ; pous, podos, a foot). That 

 joint of the limb of an arthropod animal which is arti- 

 culated to the body. 



Basi/ter'ygoid (Gr. basis, a pedestal ; pterygion, a little wirig). 

 One of the bones of the vertebrate skull ; represented in 

 Human Anatomy by the pterygoid plates. 



Basi-sphe'noid (Gr. basis, a pedestal ; sphen, a wedge) . One 

 of the bones of the vertebrate skull ; represented in Human 

 Anatomy by the posterior part of the body, of the sphenoid 

 bone. 



Basi-tem'poral (Gr. basis, a pedestal ; L. tempora, the temples). 

 One of the bones of the vertebrate skull. 



Ba'sis cra'nii. The base or floor of the skull. 



Bast or Bass. The innermost layer of the bark of an exogenous 

 tree. 



Batra'chia (Gr. batrachos, a frog). A division of the Amphibia, 

 sometimes termed Anura, which includes the frogs. 



Belemnites (Gr. belemnos, a dart). An extinct group of Cepha- 

 lopoda, the fossil remains of which were formerly termed 

 thunderbolts. 



Belodon'tidae (Gr. belos, an arrow ; odous, odontos, a tooth). A 

 group of the Crocodilia, now extinct. 



Bi'eeps bra chii (L. biceps, having two heads ; brachium, the fore- 

 arm). The double-headed muscle which flexes the fore-arm. 



Bi'ceps fe'moris (L. biceps, having two heads ; femur, the thigh). 

 One of the muscles of the thigh. 



Bicus'pid (L. bis, twice; cuspis, a pointe4 extremity). Having 

 two points, as the bicuspid teeth. Applied also to the 

 valve between the left auricle and ventricle. 



Bi'furcate (L. bis, twice \furca, a fork). To divide into two 

 branches, so as to give rise to a kind of fork. 



Bilft'teral sym'inetry (L. bis, in two ways ; Idtera, sides ; Gr. 

 symmetria, proportion). The similarity of parts on the 

 right and left sides of a body. 



