. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 96 C. M. YOUNG AND R. H EMSON. Figure 10. Response of Cenocrinus aslerius to fine sediment and a large flocculent mass of detritus dropped on the crown. (A) Sediment contacts the crown, and a large particle of detritus (arrow) falls toward one arm. (B) Detrital mass lands on the arm. Note that the fine silt elicits no dramatic responses from the arms. (C) Arm (asterisk) with large detntal particle flexes, dislodging a portion of the mass. (D) Remainder of detrital mass (arrow) remains on the arm. (E. F) Various arms in the r
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 96 C. M. YOUNG AND R. H EMSON. Figure 10. Response of Cenocrinus aslerius to fine sediment and a large flocculent mass of detritus dropped on the crown. (A) Sediment contacts the crown, and a large particle of detritus (arrow) falls toward one arm. (B) Detrital mass lands on the arm. Note that the fine silt elicits no dramatic responses from the arms. (C) Arm (asterisk) with large detntal particle flexes, dislodging a portion of the mass. (D) Remainder of detrital mass (arrow) remains on the arm. (E. F) Various arms in the region of the detrital mass flex repeatedly, apparently attempting to dislodge the attached detritus. ically have similar flexor muscles, we suspect that arm waving may be a behavior of great antiquity and com- mon to many living and extinct crinoids. Acknowledgments We thank the skilled pilots of the JSL submersibles for assistance with close-up video. This work was funded by the National Science Foundation (OCE-8916264 and OCE-9116560) and by a NATO Collaborative Research Grant (CRG-900628). Harbor Branch Contribution No. 1064. Literature Cited Brcimer, A. 1978. Recent cnnoids. Pp. 9-58 in Treatise on Invertebrate Paleontology. Part T. Eclunodermalu. I. R. C. Moore and C. Teichert, eds. University of Kansas Press, Lawrence, and the Geological Society of America, Inc., Boulder, CO. Candia Carnevali, M. D., and A. Saita. 1985. Muscle system organi- zation in the echinoderms: II. Microscopic anatomy and functional significance of the muscle-hgament-skeleton system in the arm of the comatulids (Anledon medilerranea). J Morph 185: 59-74. Carpenter, P. II. 188-4. Report on the Crinoidea collected during the voyage of HMS 'Challenger' during the years 1874-1876. The stalked crinoids. Challenger Rep Zoo/. 11, 442 pp. Cobb, J. S. 1985. The neurobiology of the ectoneural/hyponeural synaptic connection in an echinoderm. Bio/. Bull 168: 432-446. Cobb, J. {.. S., and M. Ghyoot. 1993. T
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