212 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY, 



Helicodonta may be recognized by the claw-like externals. The 

 long oval shape of the central basal plate is also unmistakable. 



On the preceding page figures are given of the species above 

 described. The scale employed is the same throughout ; the size of 

 the individual parts may be ascertained by reference to the table on 

 p. 207. 



J'igs. X and XI are from specimens showing the extreme ends of 

 the radula, stained with carbol fuchsin. They will serve to illustrate 

 what has been said about the lacinia. 



Fig. IX is from a young example of C. hortensis, and illustrates 

 the point that the accessory cones are always more distinct and visible 

 in the younger examples. At a still earlier stage the radula may be 

 said to be Endodontid in type. 



