. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. JPLEONITES 1-3 TELSON A PLEOTELSON. PLEONITES 1-3 TELSON B FIGURE 1. A. Diagram of Gnorimosphaeroma oregonensis lutea showing the whole animal and the details of its pleotelson morphology. B. Diagram of the pleotelson morphology of Gnorimosphaeroma oregonensis oregonensis (A and B after Menzies, 1954a). tolerance), but it does not do so. Further, as far as can be ascertained, there are no natural hybrids between the two forms. The osmoregulatory and ecological characteristics of Gnorimosphaeroma orego- nensis oregonensis and
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. JPLEONITES 1-3 TELSON A PLEOTELSON. PLEONITES 1-3 TELSON B FIGURE 1. A. Diagram of Gnorimosphaeroma oregonensis lutea showing the whole animal and the details of its pleotelson morphology. B. Diagram of the pleotelson morphology of Gnorimosphaeroma oregonensis oregonensis (A and B after Menzies, 1954a). tolerance), but it does not do so. Further, as far as can be ascertained, there are no natural hybrids between the two forms. The osmoregulatory and ecological characteristics of Gnorimosphaeroma orego- nensis oregonensis and G. o. lutea have been considered as adaptive in the sense of Allen (quoted by Pantin, 1932), who suggested that adaptation be measured by survival. From the teleological vantage point afforded by the experiments and observations presented in this paper, it appears that the ability of the two "sub- species" to survive within their respective habitats is correlated with their ability to osmoregulate and survive in various experimental dilutions and concentrations of sea water. Caution must be exercised in making statements concerning the actual barrier(s) or "selective factor(s)" which has permitted one form of G. orego-. 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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