DESCRIPTIONS OF FIVE NEW SPECIES OF MOLLUSCA OP THE GENERA &lt;italic&gt;DRILLIA, MARGINELLA, APICALIA, PLESIOTPTROCHUS&lt;/italic&gt;, AND &lt;italic&gt;RINGICULA&lt;/italic&gt;, ALL FBOM CEYLON; ALSO NOTES ON THE GENUS &lt;italic&gt;PLESIOTROCHUS&lt;/italic&gt;
Journal of molluscan studies