. Bulletin of the British Museum (Natural History). . Fig. 4 Otodistomum veliporum ex Dalatias ticha: (A) from SW of Barra Head, Scotland; (B) from Bay of Biscay. (These figures are directly comparable with the figures of O. cestoides in Fig. 6.) Scale: 10 mm. sac (Fig. 3B) the male duct widens to become a seminal vesicle. This elongate, oval organ may be slightly arcuate and extends antero-ventraliy to about the middle of the prostatic sac, where it narrows and joins the pars prostatica. The latter duct possesses a villous lining and a dense covering of gland-cells which fill all the availabl
. Bulletin of the British Museum (Natural History). . Fig. 4 Otodistomum veliporum ex Dalatias ticha: (A) from SW of Barra Head, Scotland; (B) from Bay of Biscay. (These figures are directly comparable with the figures of O. cestoides in Fig. 6.) Scale: 10 mm. sac (Fig. 3B) the male duct widens to become a seminal vesicle. This elongate, oval organ may be slightly arcuate and extends antero-ventraliy to about the middle of the prostatic sac, where it narrows and joins the pars prostatica. The latter duct possesses a villous lining and a dense covering of gland-cells which fill all the available space within the prostatic sac. It initially turns and runs postero-dorsally, before passing towards the anterior region of the prostatic sac, where it passes through the thin, muscular wall of the prostatic sac and assumes the form of an ejaculatory duct. This duct is very long and usually convoluted, eventually leading into a well-developed and conical permanent sinus-organ. The sinus-organ is situated within a normally deep genital atrium, the pore of which opens mid-ventrally just posteriorly to the level of the pharynx. Near to the distal extremity of the sinus-organ, the ejaculatory duct unites with the metraterm to form a short hermaphroditic duct which opens terminally (Fig. 3B). The convoluted nature of the ejaculatory duct, the size of the sinus-organ and genital atrium and to some extent the position of the genital pore, are all variable. 180. 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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