Page "Polyp" Paragraph 7
from
Wikipedia
The external form of the polyp varies greatly in different cases.
The column may be long and slender, or may be so short in the vertical direction that the body becomes disk-like.
The tentacles may number many hundreds or may be very few, in rare cases only one or two.
They may be long and filamentous, or short and reduced to mere knobs or warts.
They may be simple and unbranched, or they may be feathery in pattern.
The mouth may be level with the surface of the peristome, or may be projecting and trumpet-shaped.
As regards internal structure, polyps exhibit two well-marked types of organization, each characteristic of one of the two classes, Hydrozoa and Anthozoa.
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