Outlines of natural history for beginners |
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Página 31
... protected in part by a great jagged spine or beak de- veloped from the front of the shield which covers the head . The second ring carries a pair of feelers , which are double , and composed of numerous joints ( fig . 12 , a ) . From ...
... protected in part by a great jagged spine or beak de- veloped from the front of the shield which covers the head . The second ring carries a pair of feelers , which are double , and composed of numerous joints ( fig . 12 , a ) . From ...
Página 34
... protected . The body consists of a succession of distinct rings or segments placed one behind the other ; and each segment may carry a single pair of jointed appendages . The animal breathes air dissolved in water , and usually has ...
... protected . The body consists of a succession of distinct rings or segments placed one behind the other ; and each segment may carry a single pair of jointed appendages . The animal breathes air dissolved in water , and usually has ...
Página 42
... protected . 66 Commencing with the head ( fig . 17 , A , h ) , no distinct rings can , as already remarked , be clearly made out ; but nevertheless the head really consists of a certain number of segments consolidated into a single mass ...
... protected . 66 Commencing with the head ( fig . 17 , A , h ) , no distinct rings can , as already remarked , be clearly made out ; but nevertheless the head really consists of a certain number of segments consolidated into a single mass ...
Página 56
... Scallops , and the like . These animals derive their common name from the fact that they have the body protected by a shell , which is composed of two pieces or " valves " ( Latin , valve , folding - 56 OUTLINES OF NATURAL HISTORY .
... Scallops , and the like . These animals derive their common name from the fact that they have the body protected by a shell , which is composed of two pieces or " valves " ( Latin , valve , folding - 56 OUTLINES OF NATURAL HISTORY .
Página 66
... protected by the operculum against injury . Over its back the Whelk carries a shell , which is com- posed of a single piece , and is therefore said to be " univalve . " The shell has the general form of a cone , the broadest end of ...
... protected by the operculum against injury . Over its back the Whelk carries a shell , which is com- posed of a single piece , and is therefore said to be " univalve . " The shell has the general form of a cone , the broadest end of ...
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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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