hemal ring

hemal ring

[′hē·məl ′riŋ]
(invertebrate zoology)
A vessel in certain echinoderms, variously located, associated with the coelom and axial gland.
References in periodicals archive ?
At its upper end, the axial organ becomes more solid again [ILLUSTRATION FOR FIGURE 14 OMITTED] and gives off an extension to the oral hemal ring [ILLUSTRATION FOR FIGURE 15 OMITTED].
The structure and mode of function of the water vascular system of a brittlestar, Ophioderma appressum
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