GLOSSAEY OF TECHNICAL TERMS xxiii 



EUCALYPTS (Gr. eS, well ; /caXvTrro'?, covered ; so-called from the 



flower bud, covered by the calyx), trees of the genus Euca- 



lyptus, found in Australia. 

 EXCRETION (Lat. excretus, separated out), the function by which 



waste products are got rid of. 

 FEMUR (Lat., thigh), the thigh bone. 

 FIBULA (Lat., pin), one of the bones of the leg. 

 FISSION (Lat. fissio, a cleaving), the division of a cell into 



(usually) two daughter cells. 

 FLAGELLUM (Lat., whip), a whip-like protoplasmic projection from 



the body of a cell, capable of active movement. 

 FLUKES, a group of parasitic worms (Trematoda). 

 FCETAL MEMBRANES, sac-like membranes which serve for the 



protection, respiration and nutrition of the embryo in reptiles, 



birds and mammals. 

 FCETUS (Lat., young animal), a term usually applied to the 



partially developed young of mammals, while still within 



the womb. 

 FUNICULUS (Lat., little cord), the stalk by which the ovule or 



seed is attached to the wall of the so-called ovary in flowering 



plants. 

 GAMETES (Gr. ya/Lie'njs, spouse), sexual cells (g^rm^cgjls) which 



unite in pairs to form zygotes, which develop iflfo new 



organisms. 

 GAMETOGENESIS (Gr. ya^eVr??, spouse ; ye'reo-is, origin), the process 



by which gametes originate in the parent organism. 

 GAMETOPHYTE (Gr. ya/xerr/?, spouse ; QVTOV, plant), the sexual 



or gamete -producing generation, which alternates with the 



asexual sporophyte in many plants. 

 GAMOBIUM (Gr. ya//os, marriage ; /3tos, life), the sexual generation, 



which alternates with an asexual generation (agamobium) 



in many organisms. 



GANGLION (Gr. ydyyXiov, swelling), an aggregation of nerve cells. 

 GANOIDS (Gr. ydvos, sheen ; etSos, form), an ancient group of 



fishes, usually with polished scales. 

 GASTR^A (Gr. yaorrjp, paunch, belly), a hypothetical ancestral 



animal resembling the gastrula embryo. 

 GASTRAL CAVITY (Gr. yao-n/p, belly), digestive cavity. 

 GASTRULA (Gr. yaor?/p, belly), a stage in the development of 



multicellular animals in which the embryo consists of a 



two-layered sac, with a digestive cavity and a single opening. 



