Keywords: PZSL1853Page042.png Viviparus sp Viviparidae en Radula teeth of an undetermined river snail species Proceedings of the Zoological Society of London http //archive org/details/proceedingsofgen21zool vol 1852 http //www archive org/stream/proceedingsofgen21zool page/n67/mode/1up page 42 1853 published 1854 J E Gray text PD-old-70-1923 PZSL 1853 Gastropoda radula Viviparus |