. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CYPRID NEUROANATOMY 157. 20|am Figure 12. Light micrographs showing possible innervation of the esophagus and gut. (A-B) The esophagus of the cyprid opens on the ventral surface through the oral cone (consisting of vestigial mouthpart appendages). In these sections the esophagus appears to be closed in the region where it passes between the cephalon and thorax. Nerve roots arising from the anterior ganglionic divisions can be traced along the length of the esophagus and extend toward the gut (arrows). Innervation of mouthpar
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CYPRID NEUROANATOMY 157. 20|am Figure 12. Light micrographs showing possible innervation of the esophagus and gut. (A-B) The esophagus of the cyprid opens on the ventral surface through the oral cone (consisting of vestigial mouthpart appendages). In these sections the esophagus appears to be closed in the region where it passes between the cephalon and thorax. Nerve roots arising from the anterior ganglionic divisions can be traced along the length of the esophagus and extend toward the gut (arrows). Innervation of mouthpart appendages was not observed. (C) The neurites of ventrally located cells project to the neuropil of anterior ganglionic divisions, but few nerves could be traced out of this region. and two anonymous reviewers, whose comprehensive feed- back was used to significantly improve the manuscript. Literature Cited Anderson, D. T. 1994. Barnacles. Structure. Function. Development and Evolution. Chapman & Hall. London. 357 pages. Barnes, H., D. J. Crisp, and H. T. Powell. 1951. Observations on the orientation of some species of barnacles. J. Aiiim. Ecol. 20: 227-241. Bush, B. M. H., and M. S. Laverack. 1982. Mechanoreception. Pp. 399—168 in The Biologv of Crustacea. Vol. 3. Neurobiology, Structure and Function. H. L. Atwood and D. C. Sandeman. eds. Academic Press. New York. Clare, A. S. 1995. Chemical signals in barnacles: old problems, new approaches. Pp. 49-67 in Crustacean Issues 10: Neu- Frontiers in Barnacle Evolution. F. R. Schram and J. T. H0eg, eds. A. A. Balkema, Rotterdam. Clare, A. S., and J. A. Nott. 1994. Scanning electron microscopy of the fourth antennular segment ot Bulanus amphitrite amphitrite. J. Mar. Biol. Assoc. UK 74: 967-970. Clare, A. S., R. K. Freet, and M. McClary, Jr. 1994. On the antennular secretion of the cyprid of Balanus amphitrite amphitrite, and its role as a settlement pheromone. J. Mar. Biol. Assoc. UK 74: 243-250. Clare, A. S., R. F. Thomas,
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