. Annual report - Western Society of Malacologists. Mollusks; Mollusks. FIGURE 2 Seasonal cycles of interstitial opisthobranch assemblages along an exposure gradient : A = high exposure, D = mean exposure, G = weak exposure. S = sensitive species, VS = very sensitive, NVS = not very sensitive. A = abundance in 50 dm^ sand. Wi = Winter, Sp = Spring, Su = Summer, and Au = Autumn. nGURE3 Variation of the abundance (A/ 50 dm^ sand) of the 6 dominant species, in a gravel locality of the Gulf of Marseille, during the period of observation : I = 18 h 45; II = 22 h 30 (April 19, 1974), 111 = 01 h 00;
. Annual report - Western Society of Malacologists. Mollusks; Mollusks. FIGURE 2 Seasonal cycles of interstitial opisthobranch assemblages along an exposure gradient : A = high exposure, D = mean exposure, G = weak exposure. S = sensitive species, VS = very sensitive, NVS = not very sensitive. A = abundance in 50 dm^ sand. Wi = Winter, Sp = Spring, Su = Summer, and Au = Autumn. nGURE3 Variation of the abundance (A/ 50 dm^ sand) of the 6 dominant species, in a gravel locality of the Gulf of Marseille, during the period of observation : I = 18 h 45; II = 22 h 30 (April 19, 1974), 111 = 01 h 00; rv = 03 h 20; V = 05 h 15 (April 20, 1974). a = total assemblage; b = Philine catena: c = Hedylopsis spiculifera: d = Embletonia pulchra: e = Unela glandulifera: f = Pontohedyle milaschewitschii: g = Philinoglossa helgolandica. nGURE4 Interpretative seasonal reproductive cycle of ; A = annual species Philine catena, with only one generation per year. B = subannual species Unela glandulifera, with 2 generations per year. AD-SP = adults with 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 Western Society of Malacologists. Pomona, Calif. , Western Society of Malacologists
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