GLOSSARY. 



483 



HELICINA, like helix; a genus of 



shells. 

 HELIX, a spiral line; a genus of 



shells. 



HERBIVOROUS, living on herbs. 

 HIATELLA, lat., hiatus, the little 



gaper ; a genus of shells. 

 HIPPOPUS, horse's foot. 

 HIPPURITES, lat., liippuris ; a genus 



of shells. 

 HOLOPTYCHIUS, all wrinkle fish, in 



allusion to the corrugated scales. 

 HOMALONOTUS, a genus of trilobites, 



occurring in the Silurian deposits ; 



so named by Mr. Konig, from the 



smoothness of the back. 

 HOMOLOGUE, the analogous organ in 



different animals. 

 HORNBLENDE, a simple mineral of a 



dark-green or black colour. 

 HYAL.EA, a glass ; a genus of gastero- 



pods. 

 HYALINE, crystalline appearance, or 



pellucid. 



HYDRA, freshwater polype. 

 HYDROZOA, coral polypes organised 



like the polype. 

 HYLJEOSAURUS, the lizard of the weald. 



An extinct lizard discovered by 



Dr. Mantell in the sandstone of 



that formation. 

 HYMENOPTERA, insects with four 



membranous wings. 

 HYPOGENE, a term used by Sir C. Lyell 



to denote the primary rocks, and 



signifying that they are formed 



beneath the surface. 

 HYRIA, a honey-comb; a genus of 



shells. 



I. 



ICEBERG, a term derived from the 

 German, which literally means a 

 mountain of ice, and is applied to 

 the masses of that substance, 



often the size of hills, which float, 

 partly in, partly out of the water, 

 both in polar, northern, and 

 southern seas. 



ICHTHYOSAURUS, fish-like lizard ; a 

 gigantic marine reptile, partaking 

 of the characters of the crocodile 

 and the fish. 



IGUANA, an existing lizard, a native 

 of India, America, &c. 



IGUANODON, a colossal, extinct sau- 

 rian, discovered by Dr. Mantell 

 in the wealden formation ; so 

 named from its teeth resembling 

 those of the recent iguana. 



IMBRICATED, placed one above the 

 other, like the tiles of a house. 



INCANDESCENT, a term applied to 

 mineral masses in a state of fu- 

 sion. 



INDUCTION, the establishing a general 

 conclusion from various individual 

 facts. 



INFUSORIA, microscopic animalcules 

 generated in infusions. 



INSECTIVOROUS, animals that live on 

 insects, as the hedgehog. 



INSPISSATED, dried up. 



INVERTEBRATA, animals destitute of 

 a spine or vertebral column, as 

 the crab, worm, &c. 



IRIDINA,. lot., iris, a rainbow. 



ISOCARDIA, symmetrical heart; a 

 genus of shells. 



J. 



JANTHINA, lat., ianthum, a violet ; a 

 genus of shells. 



JURA LIMESTONE, calcaire jurassique. 

 strata of the oolitic series, which, 

 constituting the mass of Mount 

 Jura, derive, from this circum- 

 stance, the name by which they 

 arc best known on the Conti- 

 nent. 



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