FIGURE 13 in Crinoids of the stalked family Hyocrinidae (Echinodermata) collected by the USNS Eltanin in the Southern Ocean

FIGURE 13. Changes in columnal facet and axial canal along the stalk of Ptilocrinus brucei specimen USNM 1005438. A–F: columnal facets; A: in proximal mesistele; B: in mid mesistele; C: in distal mesistele; D–E: in transition mesistele/dististele; F: in mid dististele; G–L: axial canal; J–L: oblique view of G, H, I respectively; G, J: in proximal mesistele, H, K: in mid mesistele, I, L: in distal mesistele.