Comparative Anatomy And Physiology
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The tergal portions of several successive seg- ments may unite with one another, and thus give greater firmness to the dorsal surface ; this process may result in the formation of a free-projecting shell, as in Apus, or this shell may become divisible into two valves, as in the Ostracoda, or the fusion may extend far back, as in the crayfish, or the scorpion, where we have the so-called cephalo thoracic cara- pace ; in Limulus the sides of the carapace are pro- duced, and we get the well-known ...large shield of these animals ; the same phenomenon in the crayfish or the lobster results in the formation of a special wall for the branchial chamber.
The most remarkable modifications are exhibited by the Cirripedia, where the exoskeleton is ordi- narily in the form of calcified valves, two on either side of the body, and in Lepas with a dorsal median piece ; in Balanus these valves are withdrawn into a special shell.
In the Mollusca the characteristic organ of sup- port and defence is an external calcareous shell, which is formed by the mantle, and which, when aided by the operculum, which is developed on the base of the foot, becomes so completely an organ of protection that many snails hibernate in their closed shell ; the tenant of an exotic shell has been bought, sold, and exhibited in a museum for the space Chap, ix.
What to read after Comparative Anatomy And Physiology?
You can find similar books in the "Read Also" column, or choose other free books by F Jeffrey Francis Jeffrey Bell to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The tergal portions of several successive seg- ments may unite with one another, and thus give greater firmness to the dorsal surface ; this process may result in the formation of a free-projecting shell, as in Apus, or this shell may become divisible into two valves, as in the Ostracoda, or the fusion may extend far back, as in the crayfish, or the scorpion, where we have the so-called cephalo thoracic cara- pace ; in Limulus the sides of the carapace are pro- duced, and we get the well-known ...large shield of these animals ; the same phenomenon in the crayfish or the lobster results in the formation of a special wall for the branchial chamber.
The most remarkable modifications are exhibited by the Cirripedia, where the exoskeleton is ordi- narily in the form of calcified valves, two on either side of the body, and in Lepas with a dorsal median piece ; in Balanus these valves are withdrawn into a special shell.
In the Mollusca the characteristic organ of sup- port and defence is an external calcareous shell, which is formed by the mantle, and which, when aided by the operculum, which is developed on the base of the foot, becomes so completely an organ of protection that many snails hibernate in their closed shell ; the tenant of an exotic shell has been bought, sold, and exhibited in a museum for the space Chap, ix.
What to read after Comparative Anatomy And Physiology?
You can find similar books in the "Read Also" column, or choose other free books by F Jeffrey Francis Jeffrey Bell to read onlineMoreLess
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