EXPLICATION DE LA PLANCHE XII 



Fio. 1-2. — Phasianella Provençali Cossm. 

 3-5. — Collonia Cureti Cossm. 

 6-7. — var. subscalata Cossm. 



8-10. — Solariella Pellati Cossm. 

 11-12. — Astralium basiconcavum Cossm. 

 13-14. — Trochus frumentum Pict. et Camp. 

 15-16. — Callistoma Bruni Cossm. 

 17-18. — Callistoma sociale Cossm. 

 19-21. — Pleurotomaria urgonensis Cossm. 

 22-23. — Cirsochilus antecedens Cossm. 

 24-25. — Callistoma Zollikoferi Prit, et Camp. 

 26-27. — Liiostrea urgonensis [d'Qbb.]. 



28. — Alectryonia Cotteaui [Coquand], 

 29-31. — Mytilus urgonensis Cossm. 



32. — Perissoptera? pachymorpha [Cossm.]. 



33. — Cirsochilus antecedens Cossm. 



Bui l Soc. G&Oh. df Fn. — 4 , XVI. 1916. 



