Zoological Articles Contributed to the Encyclopaedia Britannica
Zoological Articles Contributed to the Encyclopaedia Britannica
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The gas is said to be of the same com- position as the atmosphere, with a larger proportion of nitrogen. With regard to its origin we have only conjec- tures. Each septum shutting off an air-containing chamber is formed during a period of quiescence, probably after the reproductive act, when the vis- ceral mass of the Nautilus may be slightly shrunk, and gas is secreted from the dorsal inte- gument so as to fill up the space previously occupied by the animal. A certain stage is reached in the g...rowth of the animal when no new cham- bers are formed. The whole process of the loosening of the animal in its chamber and of its slipping forward when a new septum is formed, as well as the mode in which the air-chambers may be used as a hydrostatic apparatus, and the relation to this use, if any, of the siphuncular pedicle, is involved in obscurity, and is the subject of much in- genious speculation. In connexion with the secretion of gas by the animal, besides the parallel cases ranging from the Protozoon Arcella to the Physoclistic Fishes, from the Hydroid Siphonophora to the insect-larva Corethra, we have the identical phenomenon observed in the closely- allied Sepia when recently hatched.
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To quickly assess the difficulty of the text, read a short excerpt:
The gas is said to be of the same com- position as the atmosphere, with a larger proportion of nitrogen. With regard to its origin we have only conjec- tures. Each septum shutting off an air-containing chamber is formed during a period of quiescence, probably after the reproductive act, when the vis- ceral mass of the Nautilus may be slightly shrunk, and gas is secreted from the dorsal inte- gument so as to fill up the space previously occupied by the animal. A certain stage is reached in the g...rowth of the animal when no new cham- bers are formed. The whole process of the loosening of the animal in its chamber and of its slipping forward when a new septum is formed, as well as the mode in which the air-chambers may be used as a hydrostatic apparatus, and the relation to this use, if any, of the siphuncular pedicle, is involved in obscurity, and is the subject of much in- genious speculation. In connexion with the secretion of gas by the animal, besides the parallel cases ranging from the Protozoon Arcella to the Physoclistic Fishes, from the Hydroid Siphonophora to the insect-larva Corethra, we have the identical phenomenon observed in the closely- allied Sepia when recently hatched.
What to read after Zoological Articles Contributed to the Encyclopaedia Britannica?
You can find similar books in the "Read Also" column, or choose other free books by E Ray Edwin Ray Lankester to read onlineMoreLess
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