. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 6 bulletin: museum of comparative zoology the Synceridae. According to Thiele (1927, Zool. Jahrb., Abt. Syst., 53, pp. 113-146) this division of the lateral is the only peculiarity dis- tinguishing the radula of all Synceridae from that of all Bulimidae (Amnicolidae). Both families contain snails with and others without. Fig. 1. A, radula of Septariellina congolensis Bequaert and Clench; B, radula of Valvatorbis manritii Bequaert and Clench; C, central tooth of radula of Potadoma agglutinans Bequaert and Clench; D, te
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 6 bulletin: museum of comparative zoology the Synceridae. According to Thiele (1927, Zool. Jahrb., Abt. Syst., 53, pp. 113-146) this division of the lateral is the only peculiarity dis- tinguishing the radula of all Synceridae from that of all Bulimidae (Amnicolidae). Both families contain snails with and others without. Fig. 1. A, radula of Septariellina congolensis Bequaert and Clench; B, radula of Valvatorbis manritii Bequaert and Clench; C, central tooth of radula of Potadoma agglutinans Bequaert and Clench; D, tentacles and penis of Sep- tariellina congolensis; E, operculum of Potadoma agglutinans. basal inner denticles on the central tooth. In most Synceridae the ac- cessory (detached) plate of the base of the lateral is more widely separated than in Septariellina; but Thiele's figure of the radula of Syncera microsculpta shows it in about the same position as in S. con- golensis. Pseudogibbula duponti Dautzenberg Dr. Wanson found this species commonly on both banks of the Congo near Matadi, fixed to rocks in very swift current. How far up and down stream from the Vivi-Matadi area it extends remains to be worked out. Our largest specimen, mm. high and mm. wide, has a corroded summit, so that the total number of whorls cannot be determined; only the last three whorls remain. Shells up to 1 mm. high and mm. wide are complete, of 3 whorls: the first (embryonic) whorl is smooth, with-. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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