GLOSSARY-INDEX 391 



blood, 191. 



blood vessels, 158. 



body cavity. The cavity between the intestine and the body wall; also 



called the coelom, 157. 

 body wall. The muscular walls which lie outside the body cavity; the 



outer wall of the body, 143, 157, 166. 

 bone, 27, 176. 



brachial (Lat. brachium = the arm). Pertaining to the arm, 190. 

 bract. A leaf in the axil of which a flower is developed. 

 brain. The enlarged front end of the nervous system in vertebrates, 192: 



sometimes applied to the cerebral ganglia of invertebrates, 162. 

 branchiae. Gills, 288. 

 branchial openings. Openings in the neck, through which water may pass 



for respiration, 285. 

 bread raising, 80. 

 breeding season. The season of the year during which reproduction 



occurs, 214. 



bronchi. The larger branches of the trachea leading to the lungs, 

 buccal. Pertaining to the mouth, 185, 284. 

 budding. Reproduction by the formation of buds which may become 



detached; gemmation, 78, 146, 239. 

 bulbus arteriosus. The large arterial trunk arising from the ventricle of 



the frog, before it breaks up into branches, 188; also called truncus 



arteriosus. 



bundle. A cluster of elongated cells, 104. 

 butterfly, 72, 289. 

 calcaneum, 182. 



calciferous (Lat. calx = lime + ferre = to bear). Lime-producing, 169. 

 callosities (Lat. callum = a thick skin). Thickenings of the skin, 

 calyx. The outer row of leaves of a flower, usually green, 119. 

 cambium (Lat. cambire = to exchange). The layer of active, growing cells 



inside the bark and outside the woody layers in exogenous plants, 105, 



108. 



cane sugar, 9. 



capillaries (Lat. capillus = a hair). The microscopic blood vessels be- 

 tween the ends of the arteries and the beginning of the veins, 190, 207. 

 capillarity, 127. 



carbohydrates. Starches, sugars, and celluloses, 9, 10. 

 Carchesium, 91. 



cardiac (Gr. cardia = heart). Pertaining to the heart. 

 carnivorous (Lat. caro (carnis) = flesh -f vorare = to eat). Feeding on 



flesh, 224. 



