. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 200 R. HERSHLER AND G. M. DAVIS Ppo Emc Ast Apo Pst. 0-5 mt» FIGURE 2. Female without head, showing organs as seen through the epithelium, but with kidney tissue removed to reveal the style sac (St), A; section of the mantle collar turned back to reveal the ciliated mantle papilla, B. Abbreviations are : Apo, anterior section of pallial oviduct (= capsule gland) ; Ast, anterior chamber of stomach: Cl, columellar muscle; D, digestive gland; Emc, posterior end of the mantle cavity; Es, esophagus; Go, gonad; In, intestine; Ma,
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 200 R. HERSHLER AND G. M. DAVIS Ppo Emc Ast Apo Pst. 0-5 mt» FIGURE 2. Female without head, showing organs as seen through the epithelium, but with kidney tissue removed to reveal the style sac (St), A; section of the mantle collar turned back to reveal the ciliated mantle papilla, B. Abbreviations are : Apo, anterior section of pallial oviduct (= capsule gland) ; Ast, anterior chamber of stomach: Cl, columellar muscle; D, digestive gland; Emc, posterior end of the mantle cavity; Es, esophagus; Go, gonad; In, intestine; Ma, mantle collar; Mpa, papilla of the mantle; Ov, oviduct; Ppo, posterior section of pallial oviduct (= albumen gland); Pst, posterior chamber of stomach; St, style sac. description of such a tubercle in North American Hydrobia. Hydrobia ulvae of Europe has a much larger pallial tentacle, similarly located (Fretter and Graham, 1962, p. 581 ; personal observation; and Taylor, 1966), but no one has speculated as to its function. It may function as a sensory aid and/or assist in voiding excrement. It is found in both sexes. Body pigmentation consists of a dark dusting of melanin pigment on the dorsal surface with a much lighter dusting of pigment on parts of the ventral surface. Operculum. The operculum (Fig. 1C) is corneous, thin and paucispiral with to rapidly expanding whorls. It is light brown in color. Its position on the operculigerous lobe is similar to that of H. totfeni (Davis, 1966, Fig. 3). The pigmentation of the foot under the operculum varies from uniformly dark all around the perimeter to discrete patches along the perimeter (Fig. 1D-F). It does not differ much from that of H. totteni (Davis, 1966, Fig. 4).. 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 (Wood
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
