Cormus sentence example

cormus
  • A typical Siphonophore is a stock or cormus consisting of a number of appendages placed in organic connexion with one another by means of a coenosarc. The coenosarc does not differ in structure from that already described in colonial Hydrozoa.

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  • The coenosarc may consist of a single elongated tube or stolon, forming the stem or axis of the cormus on which, usually, the appendages are arranged in groups termed cormidia; or it may take the form of a compact mass of ramifying, anastomosing tubes, in which case the cormus as a whole has a compact form and cormidia are not distinguishable.

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  • The cormus is always differentiated into two parts; an upper portion termed the nectosome, in which the appendages are locomotor or hydrostatic in function, that is to say, serve for swimming or floating; and a lower portion termed the siphosome, bearing appendages which are nutritive, reproductive or simply protective in function.

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  • Divergent views have been held by different authors both as regards the nature of the cormus as a whole, and as regards the homologies of the different types of appendages borne by it.

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  • In cases where the cormus has no pneumatophore the topmost swimming bell may contain an oil-reservoir or oleocyst.

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  • Never more than one pneumatophore is found in a cormus, and when present it is always situated at the highest point above the swimming bells, if these are present also.

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  • The difference between the theories of Haeckel and Chun is connected with a further divergence in the interpretation of the stem or axis of the cormus.

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  • The subsequent development is slightly different according as the future cormus is headed by a pneumatophore (Physophorida, Cystophorida) or by a nectocalyx (Calycophorida).

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  • From the broader portion of the planula an outgrowth arises which becomes the first tentacle of the cormus.

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  • In the first place the cormus has been regarded as a single individual and its appendages as organs.

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  • Contrasting, in the second place, with the polyorgan theory are the various "polyperson " theories which interpret the Siphonophore cormus as a colony composed of more or fewer individuals in or a', Pneumatocyst.

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  • It is possible to regard the cormus (I) as a colony of medusa-persons, (2) as a colony of polyp-persons, (3) as composed partly of one, partly of the other.

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  • Chun (Hydrozoa [1]) maintains the older views of Leuckart and Claus, according to which the cormus is to be compared to a floating hydroid colony.

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  • A given cormus may bear one or several nectocalyces, and by their contractions they propel the colony slowly along, like so many medusae harnessed together.

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  • In such cases the oldest cormidia, that is to say, those furthest from the nectosome, may become detached (like the segments or proglottides of a tape-worm) and swim off, each such detached cormidium then becoming a small free cormus which, in many cases, has been given an independent generic name.

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