Diplommatina sinistra Tomlin, 1938  

Tomlin (1938) original descriptions on Diplommatina (Sinica) sinistra – “About the same size as, and superficially similar to D. (Sinica) diminuta Moellendorff from Bukit Pondong: it is minute, sinistral, has 7 ½ whorls which are convex, with deeply impressed sutures, the penultimate whorl being broader and rather more dilated than the ultimate; it has about twenty-four axial costulations on the penultimate whorl and a deep-seated columella tooth, but lacks parietal and palatal teeth; the number of costulations in diminuta is not stated but must be, from the figure, many more than this; aperture in sinistra irregularly rounded except that on the right-hand side the peristome is almost straight from its junction with the body whorl, forming a chord to the irregular are of the rest of the peristome.”