512 GLOSSARY, 



laminated, and really produced by tlie alteration of a sedimentary 



deposit after its consolidation. 

 Grallatores. — The so-called Wading-birds (Storks, Cranes, Snipes, 



etc.), which are generally furnished with long legs, bare of 



feathers above the heel, and have no membranes between the 



toes. 

 Granite. — A rock consisting essentially of crystals of felspar and 



mica in a mass of quartz. 



Habitat, — The locality in which a plant or animal naturally lives. 



Hemiptera. — An order or sub-order of Insects, characterized by the 

 possession of a jointed beak or rostrum, and by having the fore- 

 wings horny in the basal portion and membranous at the 

 extremity, where they cross each other. This group includes 

 the various species of Bugs. 



Hermaphrodite. — Possessing the organs of both sexes. 



Homology. — That relation between parts which results from their 

 development from corresponding embryonic parts, either in 

 different animals, as in the case of the arm of man. the fore leg 

 of a quadruped, and the wing of a bird; or in the same indi- 

 vidual, as in the case of the fore and hind legs in quadrupeds, 

 and the segments or rings and their appendages of which the 

 body of a worm, a centipede, etc., is composed. The latter is 

 called serial hmrkology. The parts which stand in such a relation 

 to each other are said to be homologous, and one such part or organ 

 is called the homologue of the other. In different plants the 

 parts of the flower are homologous, and in general these parts 

 are regarded as homologous with leaves. 



Homoptera. — An order or sub-order of Insects having (like the 

 Hemiptera) a jointed beak, but in which the fore-wings are 

 either wholly membranous or wholly leathery. The Ctcadce, 

 Frog-hoppers, and Ajjhides, are well-known examples. 



Hybrid. — The offspring of the union of two distinct species. 



Hymenoptera. — An order of Insects possessing biting jaws and 

 usually four membranous wings in which there are a few veins. 

 Bees and Wasps are familiar examples of this group. 



Hypertrophied. — Excessively developed. 



ICHNEUMONiD^. — A family of Hymenopterous insects, the members 

 of which lay their eggs in the bodies or eggs of other insects. 



Imago. — The perfect (generally winged) reproductive state of an 

 insect. 



Indigens. — The aboriginal animal or vegetable inhabitants of a 

 country or region. 



Inflorescence. — The mode of arrangement of the flowers of plants. 



Infusoria. — A class of microscopic Animalcules, so called from their 

 having originally been observed in infusions of vegetable 

 matters. They consist of a gelatinous material inclosed in a 

 delicate membrane, the whole or part of which is furnished with 

 short vibrating hairs (called cilia), by means of which the 

 animalcules swim through the water or convey the minute parti- 

 cles of their food to the orifice of the mouth. 



