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Glossary. 435 



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 Hemi- 

 ptera) a jointed beak, but in which the fore-wings are either wholly- 

 membranous or wholly leathery. The Cicadse, Frog-hoppers, and 

 Aphides, 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, 



Ichneumonidjl — 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. 



Indigeens. — 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 enclosed 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 particles of their food to the orifice of the mouth. , 



Insectivorous. — Feeding on Insects. 



Invertebrata, or Invertebrate Animals. — Those animals which do not 

 possess a backbone or spinal column. 



Lacunae. — Spaces left among the tissues in some of the lower animals, 

 and serving in place of vessels for the circulation of the fluids of the body. 



Lamellated. — Furnished with lamellae or little plates. 



Larva (pi. Larvje). — The first condition of an insect at its issuing from the 

 egg, when it is usually in the form of a grub, caterpillar, or maggot. 



Larynx. — The upper part of the windpipe opening into the gullet. 



Laurentian. — A group of greatly altered and very ancient rocks, which 

 is greatly developed along the course of the St. Laurence, whence the 

 name. It is in these that the earliest known traces of organic bodies 

 have been found. 



Lesuminos^e. — An order of plants represented by the common Peas and 

 Beans, having an irregular flower in which one petal stands up like a 

 wing, and the stamens and pistil are enclosed in a sheath formed by two 

 other petals. The fruit is a pod (or legume). 



Lemurid^:. — A group of four-handed animals, distinct from the Monkeys 

 and approaching the Insectivorous Quadrupeds in some of their charac- 

 ters and habits.° Its members have the nostrils curved or twisted, and 

 a claw instead of a nail upon the first finger of the hind hands. 



Lepidoptera. — An order of Insects, characterised by the possession of a 

 spiral proboscis, and of four large more or less scaly wings. It includes 

 the well-known Butterflies and Moths. 



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