. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DEFENSIVE SECRETIONS OF O. BOREALIS 399. FIGURE 3. Staged encounter between Onchidella borealis and Leptasterias hexactis in a tidepool. A: Starfish touches O. borealis with tube feet; repugnatorial glands fire. B: Starfish curls arm aborally in re- sponse to secretions. C: O. borealis reverses direction of crawling while starfish remains stationary. D: L. hexactis continues to hold arm off substratum. high intertidal limpet C. digitalis. Notoacmaea scutum, a limpet that occupies the same level of the intertidal zone as L. h
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DEFENSIVE SECRETIONS OF O. BOREALIS 399. FIGURE 3. Staged encounter between Onchidella borealis and Leptasterias hexactis in a tidepool. A: Starfish touches O. borealis with tube feet; repugnatorial glands fire. B: Starfish curls arm aborally in re- sponse to secretions. C: O. borealis reverses direction of crawling while starfish remains stationary. D: L. hexactis continues to hold arm off substratum. high intertidal limpet C. digitalis. Notoacmaea scutum, a limpet that occupies the same level of the intertidal zone as L. hexactis and O. borealis, was never consumed in laboratory experiments, but several individuals were taken during the neap tide period in the field experiments, possibly after the C. digitalis had all been consumed. In the laboratory, there was a significant difference in the number of L. hexactis specimens remaining within holdfasts in the presence and absence of O. borealis (Fig. 5). Where O. borealis were present, the majority of starfish abandoned the holdfasts within the 2-h experimental period. Field experiments produced essentially the same result, except that the overall number of starfish remaining was lower than in the laboratory (Fig. 5). DISCUSSION Although interactions between molluscs and their potential predators have been studied extensively (for reviews see: Thompson, 1960; Edmunds, 1966; Todd, 1981;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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