The Microscopic Miscellany; Being Selections From the Microscopic Journal ...
The Microscopic Miscellany; Being Selections From the Microscopic Journal ...
Daniel Cooper
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— 4, liastly, after an indeterminate space of time, the larva divides spon* SXTRACT8 ANP AP^TAACTS FROM FOREIGN JOURNALS. 155 taneoudy into a number of transverse segments, all of which become new animals. The latter (not resembling the larvae) are free, swim in every sense of the word, and have a disc-like body, the periphery of which is divided into eight bifurcated rays at their extremities ; they have a quadrangular mouth, in the form of a pendent tube, &c. As they increase in size, the ray...s become shorter and shorter ; in the mean time the intervals between the rays increase in extent, and give rise to marginal tentacles ; to be brief, these animals become perfectly identi- cal with their original parent (the Medusa or Cyanea), It is not then the l$urva or the individual developed in the egg, which becomes changed into the perfect Acalepha ; but the small ones formed by the transverse and spontaneous division. This metamorphosis cannot be better com- pared than to the development of the Salpa, although offering many points of difference.
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