Outlines of natural history for beginners |
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Página 10
... open into a stomach , or even into a distinct body - cavity . Hence the food simply passes through the mouth into the semi - fluid central substance of the body , and the in- digestible parts of it are expelled by a second opening ...
... open into a stomach , or even into a distinct body - cavity . Hence the food simply passes through the mouth into the semi - fluid central substance of the body , and the in- digestible parts of it are expelled by a second opening ...
Página 11
... open ocean , they can hardly be said to be at all known in general . As the type of this class we shall take a small and abundant form which occurs in many ponds and lakes in Europe , namely , the common Fresh - water Polype ( Hydra ...
... open ocean , they can hardly be said to be at all known in general . As the type of this class we shall take a small and abundant form which occurs in many ponds and lakes in Europe , namely , the common Fresh - water Polype ( Hydra ...
Página 13
... opens into a long cylindrical cavity , which occupies the whole length of the body , and which receives the food . This cavity may therefore be regarded as the stomach ; though it is really the general cavity of the body , since it is ...
... opens into a long cylindrical cavity , which occupies the whole length of the body , and which receives the food . This cavity may therefore be regarded as the stomach ; though it is really the general cavity of the body , since it is ...
Página 14
... opens into a large chamber , which may be regarded as the stomach and body - cavity in one . There are no distinct organs of circulation , or respiration , and no traces of a nervous system . These characters distin- guish the Hydrozoa ...
... opens into a large chamber , which may be regarded as the stomach and body - cavity in one . There are no distinct organs of circulation , or respiration , and no traces of a nervous system . These characters distin- guish the Hydrozoa ...
Página 16
... opens into a globular stomach ( fig . 5 , B , b ) , and this opens below by a wide aperture into the general cavity or space included within the walls of the body . This last - mentioned space is filled with sea - water , mixed with the ...
... opens into a globular stomach ( fig . 5 , B , b ) , and this opens below by a wide aperture into the general cavity or space included within the walls of the body . This last - mentioned space is filled with sea - water , mixed with the ...
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abdomen adductor muscle Advanced Text-Books animal antennæ appendages arms attached backbone beak bivalve blood body body-cavity bone breathing-organs breathing-tubes carries cavity chambers characters distinguish colour common common Frog common House Spider composed consists contained Crown 8vo Diagram Dictionary digestive distinct heart distinct vent distinguish the class domestic Goose dorsal fin Edition Engravings eyes Fcap feelers fins fluid Flustra foot-jaws Frog front Geology gills Goose Greek Grey Lag gullet head horny Hydra insect internal anatomy intestine jointed known Latin Leech limbs Lithobius Lithobius forficatus little nervous masses Lobster lower surface lungs mantle MANUAL means membranous mouth muscular Mya arenaria nervous system opens outer pairs of legs peculiar Perch PHYSICAL GEOGRAPHY plate portion processes quadrate bone RECAPITULATION OF ESSENTIAL rings or segments rudimentary Scolecida shell side skin skull soft spines Star-fish stomach sub-kingdom sucker tail teeth tentacles thorax tion tube valve Whelk Zoology
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