"Dissection of Holothurian (Holothuria tubulosa) from the ventral surface." t, tentacles; tf, scattered tube-feet; c, calcareous ring; a, ampullae of tentacles; r, circular vessel; st, stone canal; o, Polian vesicle; rc, radial canals; lm, longitudinal muscles; g1-g2, gut; m, mesentery; cl, cloaca; an, anus; rt, right respiratory tree; ov, ovary. -Thomson, 1916

Holothurian Dissection

"Dissection of Holothurian (Holothuria tubulosa) from the ventral surface." t, tentacles; tf, scattered…