Manual of Conchology Second Series Pulmonata volume Series 2 Vol 14
Manual of Conchology Second Series Pulmonata volume Series 2 Vol 14
George Washington Tryon
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In Tomigerus the parietal lamella is small, in Hyperaulax (Bonnanius) it is wanting. Anctus laminiferus has a vertical, not entering, tooth upon the outer lip, analogous to, possibly homologous with, that of Hyperaulax ramagei. Until we know something of the pallial, muscular, digestive and genital systems of Tomigerus, Hyperaulax and Anctus, their mutual relations cannot be adequately understood. Dr. O. Von Mollendorff has recently (Nachr. D. D. Malak. Ges. , 1901, p. 126) suggested that B. Ri...dleyi belongs to the Buliminoid group Nap&us, directing attention to its similarity to species of the Azores; but the latter do not have the apical sculpture of Hyperaulax ridleyi, and I regard the resemblance as a case of convergent evolu- tion, perhaps due to some similar insular environmental factors, and not of phylogenetic significance. The typical section of the genus includes the recent species H. Ridleyi (Smith), of Fernando Noronha (Manual xi, p. 82), and the HYPERAULAX. 103 oligocene H.
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