. Le bulletin biologique. Biologie ; zoologie ; biologie ; biologie marine. SP LA FIGURE 3. Certaines parties des gonades de Petricola pholadiformis. Un undifferen- tiated, sexuellement ; stade follicule composée principalement de cellules folliculaires, nutritif vacuolisés (JC) avec gonia primaire (pg) le long de l'axe central ou lumen (lu). B, l'étape ultérieure de jeunes hommes ; la plupart des cellules folliculaires ont été cytolyzed pour fournir la nourriture pour la prolifération des cellules de la spermatogenèse (sp). La figure 4. Développement des gonades dans Mya arenaria follicule central ; avec cache-borne de noyaux indifférenciées (n), à partir de laquelle les deux follic

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SP FIGURE 3. Portions of primary gonads of Petricola pholadiformis. A, sexually undifferen- tiated stage; follicle composed mainly of vacuolated, nutritive follicle cells (Jc) with primary gonia (pg) along the central axis or lumen (lu). B, later stage in young male; most of the follicle cells have been cytolyzed to supply nourishment for the proliferating spermatogenic cells (sp). FIGURE 4. Development of primary gonad in Mya arenaria; central follicle with terminal cap of undifferentiated nuclei (n), from which both follicle cells (fc) and primary gonia (pg) originate; lower portion of follicle shows later stage in which the follicle cells are being replaced by spermatogenic cells (sp), with spermatozoa adjacent to the lumen (In). Note blood vessels (bl) and small amount of connective tissue between follicles. female phases. There will be many deviations, however, since, as already men- tioned, the primary sexual phase will be more prolonged in some individuals than in others and some will change quickly to the third (ordinarily male) phase. In the meantime younger members of the population will be functioning in the primary male phase. The proportion of individuals in which the first sexual phase is female is thought by Grave (1942) to be larger than formerly reported (Coe, 1936) but the data presented do not seem to justify such a conclusion.. 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 work.. 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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