820 Appendix 



Blastostyle (bias' to stil) (Gr. blastos, young; stylos, pillar), the portion of a 

 hydroid, such as Obelia, which forms medusa buds. 



Blastula (bias' tula) (Gr. blastos, young), spherical, hollow mass of cells result- 

 ing from the divisions of the egg. 



Blood corpuscle, one of a number of types of bodies in blood for performing 

 certain functions. 



Blood "islands," compact clusters of cells in the embryonic mesoderm for the 

 future development of an embryonic circulatory system. 



Botany (bot' ani) (Gr. botania, a plant), study of plants. 



Bowman's capsule, the enlarged end of a kidney tubule in which is found a mass 

 of thin-walled capillaries, known as a glomerulus. 



Brachial (brak' i al) (L. brachius, arm), pertaining to the arm. 



Branchial (brang' ki al) (Gr. branchia, gills), pertaining to gills. 



Bronchus (brong' kus) (Gr. bronchos, windpipe), tube leading from trachea to the 

 lungs. 



Brownian movement, the molecular movement of dispersed particles of a col- 

 loid, first described by Robert Brown. 



Bryophyta (bri -of i ta) (Gr. bryon, moss; phyta, plants), phylum of plants in- 

 cluding mosses and liverworts. 



Buccal (buk' al) (L. bucca, mouth), pertaining to the mouth. 



Bud, an outgrowth which develops into a replica of the structure from which it 

 has arisen. 



G 



Caecum (se' kum) (L. caecus, blind), a blind pouch open. at one end. 



Calcareous (kal -kar' e us) (L. calx, limy), limy composition. 



Calciferous glands (kal -sif er us) (L. calx, limy; Gr. ferro, to bear), carrying 



lime, as in earthworms. 

 Callus (kal' us) [Y,. callus, hard skin), tissue developed on wound surfaces of 



plant. 

 Calorie (kal'ori) (L. calor, heat), a unit of heat measurement, usually the 



amount of heat required to raise the temperature of 1 gram (1 c.c.) of 



water 1° C. 

 Calyptra (ka -lip' tra) (Gr. kalyptra, covering), the archegonium of a moss or 



liverwort distended or modified with the growth of the sporophyte. In 



certain mosses it is carried to the top of the capsule to form a hood. 

 Calyx (ka'liks) (Gr. kylix, husk or cup), the outer whorl of floral leaves known 



individually as sepals. 

 Cambium (kam'bium) (L. cambiore, change), the growing meristem tissue from 



which the secondary phloem and xylem arise in roots and stems; located 



between bark and wood. 

 Cambrian (from Cambria, Wales), earliest geologic period in which fossils are 



found abundantly. 

 Camouflage (ka'moofiazg) (F. camoufler, to disguise), concealment by colors or 



patterns to deceive. 

 Canaliculus (kan a -lik' u lus) (L. canaliculus, little vessel), small channels in bone 



connecting the lacunae with one another or with the Haversian canals. 



