. Bulletin of the British Museum (Natural History) Zoology. . B Neocryptocelis dayi: A, eyes in anterior region of body; B, sagittal section of copulatory organs. narrows and opens directly to the exterior. Male antrum absent. The oval muscular mass appears to represent the prostate. Female antrum narrow and shallow. Vagina thrown into an anteriorly-directed loop, its antero-dorsal portion functioning as a 'shell'-chamber, whereas the posteriorly-directed portion is exceedingly muscular and represents the vagina interna. Uterine canals open directly into the proximal end of the vagina. N
. Bulletin of the British Museum (Natural History) Zoology. . B Neocryptocelis dayi: A, eyes in anterior region of body; B, sagittal section of copulatory organs. narrows and opens directly to the exterior. Male antrum absent. The oval muscular mass appears to represent the prostate. Female antrum narrow and shallow. Vagina thrown into an anteriorly-directed loop, its antero-dorsal portion functioning as a 'shell'-chamber, whereas the posteriorly-directed portion is exceedingly muscular and represents the vagina interna. Uterine canals open directly into the proximal end of the vagina. Note. The fact that the vasa deferentia unite before passing into the male copulatory complex by a common canal agrees with Cryptocelis alba Lang and C compacta Lang, but differs from them in the distribution of eyes in the cephalic region. Genus NEOCRYPTOCELIS Diagnostic features. Cryptocelididae. Elongate-oval forms without tentacles. Cerebral and tentacular eyes in separate clusters; marginal eyes confined to anterior region of body. Genital pores separated in hind region of body; elongate spermiducal bulbs open independently into pyriform prostate, the lumen of which is divided into two sections. Vagina thrown into an anteriorly-directed loop, with ductus vaginalis. Type-species. Neocryptocelis dayi Neocryptocelis dayi Locality. On fine sand in 22 metres, 33°02'S, 17°'E, Saldanha Bay, South Africa, (Day colln.). Holo- type Description (). Elongate-oval body 17 mm long and 6 mm wide, broader anteriorly than posteriorly; without tentacles. Few very small eyes arranged in paired cerebral and tentacular clusters; marginal eyes in band extending posteriorly to level with tentacular clusters. Pharynx narrow, mainly in posterior half of body and with shallow lateral folds. Male and female genital pores about mm apart in hind region of body. Distal region of each vas deferens is modified as an elongate sper
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