. Bulletin of the British Museum (Natural History). . Fig. 14 Plychogoninnis megastoma ex Miistelus nnislelus in Adriatic Sea: (A) specimen fixed under pressure; (B) specimen fixed without pressure. Scale: 1 mm. The two irregularly-indented, subglobular tesies occur in tandem close to the middle of the hindbody. A convoluted, tubular seminal vesicle lies dorsally to the ventral sucker; it usually extends from just posterior to just anterior to this sucker. Anteriorly it joins a relatively sinuous or sigmoid pars prostatica. This latter region of the male duct is tubular, although slightly wide
. Bulletin of the British Museum (Natural History). . Fig. 14 Plychogoninnis megastoma ex Miistelus nnislelus in Adriatic Sea: (A) specimen fixed under pressure; (B) specimen fixed without pressure. Scale: 1 mm. The two irregularly-indented, subglobular tesies occur in tandem close to the middle of the hindbody. A convoluted, tubular seminal vesicle lies dorsally to the ventral sucker; it usually extends from just posterior to just anterior to this sucker. Anteriorly it joins a relatively sinuous or sigmoid pars prostatica. This latter region of the male duct is tubular, although slightly wider in its middle region, surrounded by a dense layer of prostatic cells which are delimited by the surrounding parenchyma, and lined with a layer of cells which project into the lumen (Fig. 15A). There is no prostatic sac. The pars prostatica leads into a very short, oval ejaculatory duct, and this in turn leads into a very short hermaphroditic duct, which occurs within a very small papillate sinus-organ (Fig. 15B). The genital atrium is large and its thick wall is convoluted, forming three distinct concentric muscular collars which surround the sinus-organ. The inner collar is the smallest, and the outer collar which is the largest, fills much of the atrium and possesses a terminal glandular 220. 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 British Museum (Natural History). London : BM(NH)
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