File:The Biological bulletin (19752953203).jpg

Title: The Biological bulletin
Identifier: biologicalbullet63mari (find matches)
Year: [1] (s)
Authors: 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
Subjects: Biology; Zoology; Biology; Marine Biology
Publisher: Woods Hole, Mass. : Marine Biological Laboratory
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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424 W. R. COE a predominantly male appearance. In some individuals the spermato- cytes complete their meiotic divisions to form spermatids, thereby accentuating the resemblance of the gonad to a spermary (Figs. 4-6). In other animals of the same age the gonads may retain a closer similarity to an ovary (Figs. 2, 3), and it is improbable that any spermatids are formed in every individual. All degrees of inter-
Text Appearing After Image:
FIG. 5. Primary gonad, with ovocytes (DC) and primary spermatocytes (s£c I) in synapsis; a few spermatids (s/>/) are already present on the border of the genital canal (gc); age about four months. sexuality are found, although the vast majority of individuals are predominantly male. Not infrequently some parts of the system may assume a distinctly male appearance while adjacent follicles are characteristically female, as shown in Fig. 6. The process of spermatogenesis does not continue through the winter, however, in the localities investigated and no functional

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