' 140 



Explanations to Plate V. 

 Tig. 1 Helix Nullarborica ; a. side view ; b. basal aspect, 



nat. sizes. 

 Pig. 2. Helix subsecta ; a. side view ; b. basal aspect, slightly 



enlarged. 

 Pig. 3. Utriculus apiculatus, much enlarged. 

 Pig. 4. Bulimus sinistrorsus, much, enlarged. 

 Pig. 5. Lepton trigonale, magnified. 

 Pig. 6. Zenatiopsis angustata ; a. exterior of a right valve ; 6, 



interior of a portion of left valve, nat. sizes. 

 Pig. 7a.-b. Plecotrema ciliata, much enlarged. 

 Fig. 8. Pythina gemmata, magnified. 

 Pig. 9. Lepton crassum, much enlarged. 

 Pig. 10. Turbonilla erubescens, much enlarged. 

 Pig. 11. Ethalia cancellata, «.-<?.,magnified views. 

 Pig. 12. Lepton planiusculum, enlarged. 



