File:The Biological bulletin (20192632779).jpg

Title: The Biological bulletin
Identifier: biologicalbullet185mari (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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180 R. T. BAUER AND L. J. MIN
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Figure 16. Ventral surface of posterior cephalothorax of an uninseminated female of Trachypenaeus .V/HH//V. showing thelycum. ax, apex of median protuberance; cx3, cx4, cx5, coxae of third, four, and fifth pereiopods. respectively, fl. flap; gp. gonopores; mp, median protuberance. Figure 17. Thelycum of inseminated female, showing plug substance (ps) protruding from median pocket, en. endite of coxa of pereiopod 4. Scale bar in Figure 16 represents 590 nm in Figure 16 and 421 urn in Figure 17. in the PSC of the male, as well as comparable physical properties such as hardness and homogeneity of texture in paraffin-carved material viewed with SEM (Figs. 11, 18-20). Examination of exuviae of inseminated females shows that PS remains in the median pocket from the time of insemination until the next molt, at which time it is cast off with the exuviae. Inside the cephalothorax, dorsal to the thelycum, lie a pair of cuticular invaginations, the seminal receptacles, each with large posterior and smaller anteromesial and antero- lateral lobes (Figs. 22-23). The posterior lobes are dorsal to sternite 14, while the anterior lobes lie dorsal and lateral to the median protuberance. Sections through the seminal re- ceptacles showed no spermatophores but rather sperm in a solid mass. Within the sperm mass, small, irregular patches of material, identical in appearance and staining properties to that of the MVD substance of the male, were usually observed in sectioned material. Examination of exuviae show that sperm remaining in the receptacles, often in considerable quantity, are cast off with the cuticular lining of the recep- tacles when an inseminated female molts. The opening into each seminal receptacle is a narrow slit between the anteromesial and posterior lobes that ex- tends up to the anterolateral lobe as well. Each seminal receptacle slit (SRS) begins in the roof of the median pocket just posterior to the transverse gap between flaps and median protuberance (Fig. 20), extending anteriorly along the sides of the median protuberance up to about the level of the coxal endite (Fig. 17) of pereiopod 4. Sec- tions through the posterior end of the SRS of inseminated females show that the borders of the SRS are separated but that the opening is stoppered with plug substance (Figs. 20, 21). More anteriorly, in the region just anterior to the transverse gap between flaps and median protuberance, the SRS appears functionally closed because its borders, the median protuberance on one side and a fold of the adjacent sternal wall on the other, are tightly pressed to- gether (Figs. 24, 25). The borders of the SRS separate again near its anterior end so that the anterolateral lobe of the seminal receptacle is open to the exterior near the coxal endite of pereiopod 4 (Fig. 26). In serial sections through the genital area of several females, sperm were found outside

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