The Journal of microscopy and natural science . ytes and the MedusoidAcalephse, or Jelly-fishes. So utterly different are they in size, or-ganisation, and mode of life that they were long considered asseparate and distinct creatures ; but it is now discovered that manyof the Medusae are really only the sexual apparatus of certainmembers of the Hydrozoa. The Compound Hydrozoa consists essentially of an aggregationor colony of partially independent polypites or zooids, almost iden-tical in structure with the familiar pond Hydra ; but, instead ofleading a separate existence like that animal, rema
The Journal of microscopy and natural science . ytes and the MedusoidAcalephse, or Jelly-fishes. So utterly different are they in size, or-ganisation, and mode of life that they were long considered asseparate and distinct creatures ; but it is now discovered that manyof the Medusae are really only the sexual apparatus of certainmembers of the Hydrozoa. The Compound Hydrozoa consists essentially of an aggregationor colony of partially independent polypites or zooids, almost iden-tical in structure with the familiar pond Hydra ; but, instead ofleading a separate existence like that animal, remaining permanentlyconnected with one another by a common flesh or group or colony commences its existence as a free-swimming,ciliated, oblong body, called a planula, very closely resemblingan infusorian, which soon attaches itself by one extremity to somesolid object; and at the opposite end developes a mouth, sur-rounded by a row of tentacles. The mouth opens into a chamber, Journal of Microscopy, Vol. 3,PI 18. 1 m////f n <7\. >—. ?v «. >/
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