. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 236 REPORTS FROM THE MBL GENERAL SCIENTIFIC MEETINGS. Zigzag B OJ .c T3 c c ra c. O Dead Llm n=26 SW n=»» No Flow n=24« MJ 11=73 Memo n=88 Llm Cast n=35 Figure 1. (A) Responses of channeled and knobbed whelks to all targets. Orientation: defined in text. Slow down: a reduction in crawling speed near the source, where speed within 10 cm from the source was less than 80% of the speed over the prior 90 cm distance. Zigzag: defined in text. *Significant difference ()f. a = .01). (B) Responses of orienting channeled whelks (Busyc
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 236 REPORTS FROM THE MBL GENERAL SCIENTIFIC MEETINGS. Zigzag B OJ .c T3 c c ra c. O Dead Llm n=26 SW n=»» No Flow n=24« MJ 11=73 Memo n=88 Llm Cast n=35 Figure 1. (A) Responses of channeled and knobbed whelks to all targets. Orientation: defined in text. Slow down: a reduction in crawling speed near the source, where speed within 10 cm from the source was less than 80% of the speed over the prior 90 cm distance. Zigzag: defined in text. *Significant difference ()f. a = .01). (B) Responses of orienting channeled whelks (Busycotypus) to control and experimental sources, presented in order of responsiveness. Dead Lini, dead, punctured and bleeding Limulus body: SW, seawaler control: No Flow, fluid source nozzle and lead weight only: MJ, mussel juice: Memo, Limulus hemolymph: Lim cast, dark painted cement cast of Limulus. "a " and "b " denote significant differences (r.« = -on. Supported by the National Science Foundation Research Expe- rience for Undergraduates at the Boston University Marine Pro- gram (OCE 0097498). We thank Gabriele Gerlach for statistical advice and the laboratory of Robert Barlow, Jr. for the loan of the Limulus cast. Literature Cited 1. Moore, P. A., N. Scholz, and J. Atema. 1991. J. Chem. Ecol. 17: 1293-1307. 2. Croll, R. P. 1983. Biol. Rev. 58: 293-314. 3 Edwards, A. L., and M. G. Harasewych. 1988. J. Shellfish Res. 7: 467-472. 4. Davis, J. P. 1981. Bi,,l. Hull. 161: 338-339. 5. Smith. C. R. 1977. Veliger 19: 331-340. 6 Weissburg, M. J., and R. K. Zimmer-Faust. 1993. Ecology 74: 1428-1443. 7. Alternative Bait-Trap Design Workshop for Horseshoe Crabs. 5 Oct. 1999. Atlantic States Marine Fisheries Commissions Horseshoe Crab Technical Committee, Essington, PA. 8. Stenzler, D., and J. Atema. 1977. J. Chem. Ecol. 3: 159-171. 9. Himmelman, J. H. 1988. Mar. Bin/. 97: 521-531 Reference: Binl. Bull. 203: 236-238. (October 2002) Central Pathways Mediating Oculomo
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