Journal of conchology . form Planorbis carinatus Miiller.—In a backwater of the Trentand Mersey Canal, near Consall Mill, Staffordshire, a very scalariform example ofPlatiofbis caiinatus, young, was taken on June 1st, 1918. In addition to the fol-lowing species :—PI. carinatus Miiller, PI. corneiis Linne, PL vortex Linne, stagnalis Linne, Acroloxus lacustris Linne, and Valvata piscinalis Miiller,all of which were present in great numbers on the reeds, an unusually large formof Physa fontinalis Linne was also taken in some abundance.—W. E. Alkins{Read before the Society, June 12th, 1918)

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Journal of conchology . form Planorbis carinatus Miiller.—In a backwater of the Trentand Mersey Canal, near Consall Mill, Staffordshire, a very scalariform example ofPlatiofbis caiinatus, young, was taken on June 1st, 1918. In addition to the fol-lowing species :—PI. carinatus Miiller, PI. corneiis Linne, PL vortex Linne, stagnalis Linne, Acroloxus lacustris Linne, and Valvata piscinalis Miiller,all of which were present in great numbers on the reeds, an unusually large formof Physa fontinalis Linne was also taken in some abundance.—W. E. Alkins{Read before the Society, June 12th, 1918). 53 THE GENITALIA OF AZECA TRIDENS ANDCOCHLICOPA LUBRICA. By a. E. boycott. (Read before the Society, February 14th, 1917). There seems to be some doubt about the morphology of the lowergenitalia in these two species. I give here a drawing derived fromrecent observations. Gross dissection has in each case been checkedby serial microscopical sections ; the figures have actually been re-constructed from the

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Keywords: ., bookauthorconcholo, bookcentury1800, bookdecade1870, bookyear1879