Sea-cucumber Small 320×142 Medium 640×285 Large 1024×456 Download Tiff Original 2400×1068 | (2.5 MB) Description Sea-cucumbers are Echinoderms. They are worm-like in form. They move about by the alternate contraction and extension of their bodies. Keywords Echinoderm, Echinodermata, Holothuroidea, sea-cucumber Galleries Sea Cucumbers Source: H. Alleyne Nicholson, An Introductory Text-book of Zoology(Edinburgh:William Blackwood and Sons, 1971) 56
