368 GLOSSARY 



Golgi Bodies: A cytoplasmic apparatus consisting, in its 

 localized form, of a network, and, in its dispersed form, 

 of scattered granules. It appears' to divide on the mito- 

 tic spindle, and seems to have some important function 

 connected with secretion. 



Habitat: The locality in which a given animal or plant 

 normally lives. 



Hallux: The great toe, opposable in the ape, but not in man. 



Heredity: ''The appearance in offspring of characters whose 

 differential causes are in the germ cells" (Conklin). 



Heterozygous: Hybrid, — the condition in which the chromo- 

 somal genes paired by syngamy in the zygote are unlike. 



Homologous Chromosomes: Corresponding chromosomes of 

 the same synaptic pair, being of paternal and maternal 

 origin respectively. 



Homozygous: Pure, — the condition in which the chromo- 

 somal genes paired in the zygote by syngamy are alike. 



Hormone: An internal secretion elaborated in the endocrine 

 or ductless glands and diffused in the blood stream for 

 the purpose of influencing the activities or metabolism of 

 parts of the organism at a distance from the source of 

 the hormone, e.g., secretin, gastrin, adrenalin, etc. 



Hydrotheca: The cuplike extension of the perisarc (skeletal 

 sheath) surrounding the hypostome (oral cone) and ten- 

 tacles of certain polyps'. 



Hyloblatic: Resembling the gibbon. 



Lemurs: Four-handed animals allied to the Insectivora, 

 with curved nostrils and a claw instead of a nail on the 

 first finger of the rear hands. 



Lethals: A genetical term for hereditary factors (genes) 

 which cause the death of the gametes or the zygotes that 

 contain them. In the case of zygotes, death results from 

 the homozygous, but not from the heterzygous', condition. 



Linin: Same as oxychromatin. 



Litoptema: A suborder of extinct ungulate mammals from 

 the Miocene and Pliocene of South America resembling 

 horses or llamas. 



