. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. POLYPIFEKA. 11 tion with each other, or forms in other words the body of the community, and from this common body buds are thrown out, from which ramifications are produced in all re- spects resembling those met with in the vegetable kingdom ; these constitute the trunk and branches of a tree, which, instead of bearing flowers, produces polypes provided with tentacula, a digestive cavity, and most frequently a reproductive apparatus. Tentacular apparatus.— In the Tubularidae the tentacula are situated, as in all polypes,
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. POLYPIFEKA. 11 tion with each other, or forms in other words the body of the community, and from this common body buds are thrown out, from which ramifications are produced in all re- spects resembling those met with in the vegetable kingdom ; these constitute the trunk and branches of a tree, which, instead of bearing flowers, produces polypes provided with tentacula, a digestive cavity, and most frequently a reproductive apparatus. Tentacular apparatus.— In the Tubularidae the tentacula are situated, as in all polypes, around or in the immediate vicinity of the oral opening. Their number is very various, even in the same species, but the variations in their length are more apparent than real, for their contractile powers are such that they are constantly changing in their shape and dimensions, in which respect they resemble the Hydra described above. It is towards the extremity of the tentacle that this con- tractile power is most remarkable ; and when the organ is not fully stretched out, it is enlarged or dilated near the end, insomuch that some authors have erroneously looked upon this part as performing the office of a sucker. The disposition of the tentacula varies in different genera. The genus Eudendrium has a single row of tentacula, which are alternately placed a little more internally and externally. The genus Tubularia, properly so called, has a second row of shorter tentacles immediately surrounding the proboscidiform prolongation which constitutes its mouth, and in the genus Stipula (Sars) there is an additional row situated between these two, so that there are genera with one, two, or several rows of ten- tacula ; the lower row is, however, always the longest, and it is these that are persistent when there is only one rank. The tentncula are arranged in whorls in all the Tubularidae, except in the genus Syncori/na, in which they are distributed without regularity (fig. 4-7).
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