Outlines of natural history for beginners |
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Página 18
... terminate in little pincers . In the centre of the under surface of the body is placed the opening of the mouth , surrounded by a fringe. Fig . 6. - The Common Star - fish ( Uraster rubens ) , natural size , viewed Fig . 8. - Rotifera ...
... terminate in little pincers . In the centre of the under surface of the body is placed the opening of the mouth , surrounded by a fringe. Fig . 6. - The Common Star - fish ( Uraster rubens ) , natural size , viewed Fig . 8. - Rotifera ...
Página 20
... terminates in an intestine , which opens by a minute vent upon the back of the animal . The nervous system has the form of a circular cord surrounding the mouth , and sending a branch along the groove in each of the arms . At the tip of ...
... terminates in an intestine , which opens by a minute vent upon the back of the animal . The nervous system has the form of a circular cord surrounding the mouth , and sending a branch along the groove in each of the arms . At the tip of ...
Página 26
... terminates at a distinct vent placed on the back a little in front of the hinder sucker . There is no distinct heart , and the place of the blood- vessels is taken by a peculiar system of tubes , containing a fluid which appears to play ...
... terminates at a distinct vent placed on the back a little in front of the hinder sucker . There is no distinct heart , and the place of the blood- vessels is taken by a peculiar system of tubes , containing a fluid which appears to play ...
Página 31
... terminate in nipping - claws , but these are quite of small size . The fourth and fifth pairs of legs are provided with simply pointed extremities . The fifteenth segment ( being the first of the abdomen CLASS CRUSTACEA . 31.
... terminate in nipping - claws , but these are quite of small size . The fourth and fifth pairs of legs are provided with simply pointed extremities . The fifteenth segment ( being the first of the abdomen CLASS CRUSTACEA . 31.
Página 33
... terminate by a distinct vent at the base of the last segment of the body ; and there is a well - developed liver . The heart ( fig . 14 , h ) is placed upon the back , and drives the pure blood , which has passed through the gills , to ...
... terminate by a distinct vent at the base of the last segment of the body ; and there is a well - developed liver . The heart ( fig . 14 , h ) is placed upon the back , and drives the pure blood , which has passed through the gills , to ...
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Palavras e frases frequentes
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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