Proceedings of The Academy of Natural Sciences (Vol. 116, 1964)

absent Academy of Natural Amnicola ANSP apex apical asellus basal Bolívar Brazil Bruner bundle Calamacris carina Ceraia cerci cerciform processes cercus Ceriphasia chaetae cingulum Colomesus color Diplommatina distal tooth dorsal dorsal aspect Dorsal chaetae Elimia elongate epiproct Euceraia fastigium female femora femur frontal genus Goniobasis Guiana Haldeman Hebard Helicina holotype Huánuco Ichthiacris inner ventral border larvae lateral aspect lateral lobes length longer than wide Lymnaea male margin median Melania mesosternal Müller narrow needles nodulus outer ventral border ovipositor paratype phallic structures Philippia krebsii Physa Planorbis Pleurocera Posterior femora posteriorly Pristina Proc pronotal pronotal lobes pronotum Prostomium protoconch psittacus red-brown Rehn Sargasso Sea sclerotic segments set of dimensions shell actually slightly specimens spines along inner spines along outer subgenital plate Tenth abdominal tergite tenth tergite tergal lobes tergum titillator TOD cited fig transverse Tryon type species ventral ventral aspect ventral chaetae Wheatley Collection wings