d^^ Tin: ANNALS MAGAZINE OF NATUEAL IIISTOIIY. [NINTH SICRIICS.] No. 72. DECEMBER 1923. LXVIT. — Notes on African Non-marine Molluscn, with Descriptions of many new Species (cout.). By M. Connolly. [Plate XIX.] Subfamily STE^'OGYItIN^ (cont.). The next four genera are founded on somewhat artificial coucliological grounds, whose limits it is extremely difficult to define. While Pseudopeas is^ normally, easily deter-minable by the spiral sculpture of its apical whorls, a feature absent from the other three genera, this sculpture is sometimes so faint that it can only be imagined under a magnification of over a hundred. Curvelta, normally distiu-guis liable through its short obese shell and strongly-arched profile of the outer lip, as well as its large eggs, few in number, is frequently so attenuate that it might easily be an Opeas, while eggs are no guide, if not present within the shell. Opeas and Euonyma, slender forms without columellar truncation, are merely divided by a length-line, roughly-less or greater, respectively, than 14 mm. Euonyma, in particular, is an unsatisfactory genus as at present consti-tuted, but more extended knowledge of the anatomy is necessary before any of the group can be stabilised. Ann. cfc Mag. N. tlist. Ser. i). Vol. xii. -42
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