First Book of ZoölogyD. Appleton, 1875 - 190 páginas |
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Página iv
... stages that naturalists , with few exceptions , have passed through in their boyhood . If one recalls the way in which boys first manifest their taste for such studies , he will remember that first a few ex- amples were brought together ...
... stages that naturalists , with few exceptions , have passed through in their boyhood . If one recalls the way in which boys first manifest their taste for such studies , he will remember that first a few ex- amples were brought together ...
Página 5
... stages it would assume : a representing the first increase in size , b the next stage , and c the appearance of the shell when the additional half - whorl has been completed . B А C α C Ъ FIG . 8. - FRESH - WATER SHELLS . 5 200.
... stages it would assume : a representing the first increase in size , b the next stage , and c the appearance of the shell when the additional half - whorl has been completed . B А C α C Ъ FIG . 8. - FRESH - WATER SHELLS . 5 200.
Página 20
... the Eggs . With the aid of a magnifying - glass , the eggs may be watched from day to day , and the young snail can be seen in its various stages of growth . 20. If a land - snail is taken out of 20 FIRST BOOK OF ZOOLOGY .
... the Eggs . With the aid of a magnifying - glass , the eggs may be watched from day to day , and the young snail can be seen in its various stages of growth . 20. If a land - snail is taken out of 20 FIRST BOOK OF ZOOLOGY .
Página 28
... stages of growth , or increase of the shell , as in the lines of growth in the snail - shell already studied , and , as in the snails , the growth takes place at the margin of the shells . The pupil may trace these concentric lines back ...
... stages of growth , or increase of the shell , as in the lines of growth in the snail - shell already studied , and , as in the snails , the growth takes place at the margin of the shells . The pupil may trace these concentric lines back ...
Página 29
Edward Sylvester Morse. Forward or anterior end . early stages in the growth of the shell are usually destroyed . In very young shells , however , the early stages can be plainly seen . Back or dorsal region . U www Ventral region . FIG ...
Edward Sylvester Morse. Forward or anterior end . early stages in the growth of the shell are usually destroyed . In very young shells , however , the early stages can be plainly seen . Back or dorsal region . U www Ventral region . FIG ...
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551 Broadway abdomen adductor animal antennæ aperture appearance appendages APPLETON attached beetle bird bivalves body bones breathe air butterfly called canker-worm caterpillar cephalo-thorax chrysalis clam claws collected common compound eyes crab crawfish crawling creature creeping disk crustaceans deposit edge eggs examine eyes flattened following figure represents foot fresh-water mussels fresh-water snails gills grass grasshopper hatch head hind-leg hinder insects jaws jointed legs labium land snails larva larvæ Let the pupils ligament lines of growth lobster mandibles mantle maxillæ metatarsus moults mouth mouth-parts muscles mussel myriopods natural nests number of segments operculum oyster pairs of legs palpi palpus portion Price Prof pupa salamander salt-water seen separate shed shell showing side siphon skin species specimens spiders spinnerets spiracles stages surface tentacles thorax thread true insects tube valves vertebral vertebral column wings worms young