12 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



'^^'^^^^^^^^m^w?/ 



Aa. PyTamldLu-la rupestrls (embryo), x 1300 



A-h. Patulaslra bolrael (embryo), x looo 

 7 



4c. Patu-lastra balm-ei, x 750 



"^"^^, 



I 



4d. Valloula pulcKella, x 750 



"^"^^^ 



4e. Helicodlscus lirveatus, x750 



Figs. 4ffl-e.— Representative teeth from the radula of an embn^o of Pyramidula 

 rupestris, from Burnsall, Wharfedale ; of a full-grown specimen of Vallonia 

 pulchella, from Madingley, Cambridgeshire ; and of embryonic and full- 

 grown examples of Patulaatra balmei, and a full-grown specimen of 

 Helicodiscus lineatus, from the Glasnevin Botanic Gardens, Dublin. 



