. Bulletin of the British Museum (Natural History) Zoology. . Prostheceraeus boucheti: A, dorsal surface of body in life; B, tentacles and arrangement of eyes in preserved specimen. Genus CYCLOPORUS Lang, 1884 Diagnostic features. Small oval forms with smooth or papillate dorsal surface. Small marginal tentacles with eyes in their bases and ventral surfaces. Cerebral eyes in two closely associated elongate clusters. Intestinal trunk extends to near posterior end of body, dividing into three branches anteriorly, median branch passing over cerebral organ; 6 to 10 pairs of lateral intestin
. Bulletin of the British Museum (Natural History) Zoology. . Prostheceraeus boucheti: A, dorsal surface of body in life; B, tentacles and arrangement of eyes in preserved specimen. Genus CYCLOPORUS Lang, 1884 Diagnostic features. Small oval forms with smooth or papillate dorsal surface. Small marginal tentacles with eyes in their bases and ventral surfaces. Cerebral eyes in two closely associated elongate clusters. Intestinal trunk extends to near posterior end of body, dividing into three branches anteriorly, median branch passing over cerebral organ; 6 to 10 pairs of lateral intestinal branches anastomose and terminate in small vesicles opening on margin of body. Vasa deferentia unite and immediately open into large seminal vesicle; prostate vertically disposed dorsally to male pore. Male antrum rela- tively deep; penis-papilla with stylet. Vagina narrow; uterine canals with vesicles. Cycloporus papillosus (Sars, in Jensen, 1878) Bock, 1913 Thysanozoon papillosum Sars, in Jensen, 1878 Cycloporus papillosus Lang, 1884 Locality. Non-papillate form under stones at low tide, Porto Praya, Cape Verde Is (Laidlaw, 1906). Known also from Scandinavia, United Kingdom, NW France, Mediterranean and Vietnam. Descriptions. Lang, 1884:568; Bock, 1913:262. Genus OLIGOCLADUS Lang, 1884 Diagnostic features. Small oval forms with smooth dorsal surface. Pointed marginal tentacles, each with many eyes on ventral side. Cerebral eyes in two groups. Mouth anterior or ventral to cerebral organ; tubular pharynx well developed; intestinal trunk with 3 or 4 pairs of non-anastomosing lateral branches and extending to near posterior end of body, where it opens by a median dorsal pore. Male genital pore ventral to pharynx; vasa deferentia open independently into seminal vesicle lying dorso-posteriorly to male pore. Female genital complex ventral to hind region of pharyngeal chamber; uterine canals bear 1 to 4 pairs of vesicles. Oligocladus sanguinolentus (Quatrefages, 1845) Lang, 1884 P
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