Text Appearing Before Image: 94 C. M. YOUNG AND R. H. EMSON Text Appearing After Image: Figure 7. Response of Endoxocrinus parrae to an individual crustacean contacting the arm. (A-C) Crustacean (position and direction of swimming indicated by arrows) enters rapidly from the right side of the field and moves into crown region of crinoid. (D) Arm begins to flex immediately after crustacean contacts it, and crustacean responds by swimming rapidly away (arrow). (E-F) Arm contacted by crustacean continues to Ilex until it is maximally extended. with the views of most previous workers (e.g., Muller. 1843; Breimer, 1978; Grimmer and Holland, 1987). An alternative hypothesis, invoking hydraulic pressure in the coelomic canals of the arms as a mechanism of arm ex- tension, has been put forward by Candia Carnevali and Saita (1985). Grimmer and Holland (1987), however, showed experimentally that destruction of these coelomic canals did not affect recovery from flexure in the coma-
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