Rhythmical Pulsation in Scyphomedusae
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As might be expected in Medusae living in shallow lagoons, where evaporation is great, Cassiopea will withstand a considerable concen- tration of the salt water ; however. Medusae in 100 cc. sea-water plus I gram NaCi will survive for 12 hours, but their pulsation becomes irregular, although on the average of about normal rate. The mouth- arms, however, are strongly contracted, and the Medusa exhibits alternate periods of rest and activity in its rhythmical movements.
Cassiopea will pulsate nor...mally in sea- water saturated with CaSOi.
As will be apparent from the above, Cassiopea xamachana is one of the hardiest of Scyphomedusae. It survives for months in aquaria with but ordinary care, and exhibits wonderful recuperative powers from the effects of poisons. If subjected to constant shaking, as in a floating live-car, it does not thrive as well as in stationary aquaria where the water is not so pure.
NATURE OF THE PULSATlON-STlMUtUS. 1 9 THE NERVOUS OR EPITHELIAL NATURE OF THE STIMULUS WHICH PRODUCES CONTRACTIONS.
What to read after Rhythmical Pulsation in Scyphomedusae?
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To quickly assess the difficulty of the text, read a short excerpt:
As might be expected in Medusae living in shallow lagoons, where evaporation is great, Cassiopea will withstand a considerable concen- tration of the salt water ; however. Medusae in 100 cc. sea-water plus I gram NaCi will survive for 12 hours, but their pulsation becomes irregular, although on the average of about normal rate. The mouth- arms, however, are strongly contracted, and the Medusa exhibits alternate periods of rest and activity in its rhythmical movements.
Cassiopea will pulsate nor...mally in sea- water saturated with CaSOi.
As will be apparent from the above, Cassiopea xamachana is one of the hardiest of Scyphomedusae. It survives for months in aquaria with but ordinary care, and exhibits wonderful recuperative powers from the effects of poisons. If subjected to constant shaking, as in a floating live-car, it does not thrive as well as in stationary aquaria where the water is not so pure.
NATURE OF THE PULSATlON-STlMUtUS. 1 9 THE NERVOUS OR EPITHELIAL NATURE OF THE STIMULUS WHICH PRODUCES CONTRACTIONS.
What to read after Rhythmical Pulsation in Scyphomedusae?
You can find similar books in the "Read Also" column, or choose other free books by Alfred Goldsborough Mayor to read onlineMoreLess
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