400 GLOSSARY. 



Ganglion — A centre of nervous matter from which nerves radiate. The 

 spinal chord is a series of ganglia blended together. So is the brain. 



Gasteropoda — Molluscs wliich crawl on their ventral surface — e. g. the Slug, 

 Snail, &c. 



GONIASTER — One of the Star-fishes. 



Hepatic — Belonging to the liver. 



Hermaphrodite — Having both sexes combined in a single individual. 



HistologicaIj — Histology is the doctrine of the tissues ; and tissues are the 



webs out of which the organism is fabricated. Organs aro composed of 



various tissues. 

 HOMOLOGUE — The same organ in different animals, having identity of parts 



with variety in form and function. The wing of a bird is the homologue of 



a man's arm, and of a whale's fin. But a gill is the analogue of a lung, not 



the homologue. 

 Hydra — Fresh-water Polype. 



Larva — The insect before its transformation. 

 Larviparous— Producing offspring by Larvae. 

 Lern.ka — An order of crustacean parasites. 

 LiMAX— The slug. 



Medus.e— Jelly-fish. 



Molluscs — A division of the animal kingdom embracing great varieties — 



e. g. the Oyster, Cuttle-fish, Snail, &c. 

 Morphological — Morphology is the doctrine of the changes of form which 



organs undergo during development. 



Nais — A worm very common in ponds ; also found in salt water. 

 Neurilemma — The investing sheath of the nerve. 



NUDIBRANCHS — An order of Gasteropod molluscs having their gills exposed 

 — e. g. Doris, Tritonia, &c. 



OisoPHAGUS — The tube leading from the mouth into the stomach. 

 Ovary — The organ in which the eggs are formed. 



Parenchyma— The soft tissue of organs ; generally applied to that of glands. 

 Parietes — The walls of tlio different cavities of the body. 

 Parthenogenesis — The production of offspring from unfertilised eggs — i. e. 



from virgin mothers. 

 Pecten — A bivalve Mollusc — the Scallop, 

 Pedicellaria — A curious organ —perhaps a parasite — found growing round 



the spines on the skin of the Star-fish. When magnified it looks like a pair 



of pincers. 



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