Abnormalities in the Radula of Drymaeus virgulatus (Fér.)

Very few references concerning abnormal radulae are to be found in the literature on non-marine mollusca, and these deal only with abnormalities in the number and form of the teeth. A very interesting deformation in the position and appearance of the transverse rows of teeth, of which we could find no other recorded instance was found in a number of Drymaeus virgulatus (Fér.).