GLOSSARY. 1 7 



Brachialis anti'cus (L. brachialis, relating to the arm ; anticus, 



forward, in front). A muscle arising from the humerus 



and inserted in the ulna. 

 BracM'ferous disk (L. brachium, the arm ; fero, I bear, carry). 



The floor of the sub-umbrellar cavity in the Rhizosto- 



midas, from which the " arms " are given off. 

 Brachio poda (Gr. brachion, an arm ; pous, a foot). A division 



of the Mollusca having long ciliated arms and bivalve shells. 

 Bra'chium (L. the fore-arm). The division of the anterior 



extremity which lies between the shoulder and the 



elbow. 

 Bra'chyceph'ali (Gr. brachus, short ; kephale, the head). Those 



members of the human race which have short skulls, that 



is, with a cephalic index of 80 or above. 

 Brachyu'ra (Gr. brachus, short ; oura, the tail). A subdivision 



of the Crustacea in which the abdomen is comparatively 



small. 

 Bract (L. bractca, a thin plate). The modified leaf commonly 



found at the base of a flower-stalk in plants. 

 Bran'chiae (Gr. gills). The respiratory organs of fishes and some 



amphibians, adapted for breathing the air dissolved in 



water. 

 Branchial (Gr. branchia, a gill). Relating to the gills. Applied 



to the heart of an invertebrate animal, it signifies a heart 



which receives its blood from the vessels of the gills, and 



not from the systemic vessels. 

 Bran'chio-car'diac canals (Gr. branchia, a gill ; kardia, the 



heart). In the Crustacea, canals which bring the blood 



from the gills to the heart. 

 BrancMogastero'poda (Gr. branchia, a gill ; gaster, the stomach ; 



potts, podos, a foot). The Gasteropoda which breathe by 



gills. 

 Branchio'poda (Gr. branchia, a gill ; pom, podos, a foot). A 



group of Crustaceans having gills supported by the feet. 

 Branchios'tegal membrane (Gr. branchia^ a gill ; stego, I cover). 



A membrane which forms an inner covering to the gills 



in Teleostean fishes. 



Branchios'tegite (Gr. branchia, a gill ; stego, I cover). A cover- 

 ing, or protection for the gills. 



Bron'chial (Gr. bronchos, the wind-pipe). Relating to the air- 

 passages and lungs. 

 Bron'chus (Gr. bronchos, the wind-pipe). The name given to 



each of the two primary branches of the trachea. 



