Fig. 



1. 



a, 



b] 



Nucula 



varicosa Bell. 



j> 



2. 



a, 



b, 



id. 



apenninica Bell. 



9 



3. 



a, 



b, 



id. 



Borsoni Bell. 



9 



4. 



a, 



b, 



id. 



inaequalis Bell. 



9 



5. 



a, 



b, 



id. 



dertonensis Bell. 



B 



6. 



a, 



b, 



id. 



Jeffreysi Bell. 



* 



7. 



a, 



b, 



Leda 



clavata (Cale.) 



* 



8. 



a, 



b, 



id. 



Hoernesi Bell. 



9 



9. 







id. 



nudata (Defr.) 



9 



10. 







id. 



sublsevis Bell. 



» 



11. 







id. 



consanguinea Bell. 



» 



12. 







id. 



Bonellii Bell. 



9 



13. 







id. 



Seguenza? Bell. 



» 



14. 







id. 



concava (Bromi) 



» 



15. 







id. 



id. var. A. 



» 



16. 







id. 



Brocchii Bell. 



9 



17. 







Yoldia 



longa Bell. 



9 



18. 







id. 



Bronni Bell. 



9 



19. 







id. 



af finis Bell. 



9 



20. 







id. 



nitida (Brocch ) 



9 



21. 







id. 



Genei Bell. 



» 



22. 







id. 



Philippii Bell. 



9 



23. 



a, 



b, e, 



Malletia 



transversa (Ponz.) 



a 



24. 







Neilo 



Monterosati Bell. 



9 



25. 







id. 



gigas Bell. 



» 



26. 







id. 



Isseli Bell. 



9 



27. 



a, 



'b, e, 



Tindaria 



arata Bell. 



