Crinoid Small 297×320 Medium 594×640 Large 950×1024 Download Tiff Original 2226×2400 | (5.1 MB) Description Crinoids are Echinoderms. They are distinguished by the fact that they are fixed, during the whole or a portion of the life of the animal, to submarine objects by means of a jointed flexible stalk or column. Keywords Comatula, crinoid, crinoids, Echinoderm, Echinodermata, feather star Galleries Sea Urchins and Sea Stars Source: H. Alleyne Nicholson, An Introductory Text-book of Zoology(Edinburgh:William Blackwood and Sons, 1971) 55