PLANCHE III 



1-4. TENUrCERITHIUM CRASSICOSTATUM [Desh.]. 



5-6. Tenuigerithium costulatum [Lamk.J. 



7-11. PoTAMiDES PERDITUS (Bayan). 



12-14. Cerithium (Serratoccrithium) serratijm Brug. 



15-16. Potamides lapidum [Lamk.]. 



17-18. Teliostoma Abrardi Cossm. 



19-20. Newtonieli.a cf. Dumasi Cossm. 



21-23. PiRENELLA coNFUSA Cossm. 



24-25. Clavogerithium Lacazei [Vasseur]. 



26. Mathildia gracilis de Boury. 



27-28. Cerithium (Tiaracerithium) V-asseuri. 



29-30. Newtoniella (Seila) variata [Desh.]. 



31-32. Cerithiopsis PoisoTi Cossm. 



33-34. Cerithiopsis (Metaxia) trachycosmeta Cossm. 



35-36. Triphora (Ogivia) gymna Cossm. 



37. Vermetus (Burtinella) armoricensis Cossm. 



38. Vermetus (Burtinella) poi-ygonus [Desh.]. 

 39-40. Tenuigerithium Hœrnesi [Desh.]. 

 41-42. HiPPONYX digitata Cossm. 



43-44. Tectariopsis Dumasi Cossm. 



45. Adeorbis tenuistriatus Desh. 



46. Pseudantalis {Lobinterna) subeburnea [d'Orb. 

 47-48. Potamides (Exechestoma) gampbonensis [Vass.] 

 49. Fustiaria Dumasi Cossm. 



.50-51. Pyramidei.la (Voluspa) terebellata (Fér.). 

 52. Cerithium (Serratocerithium) serr.\tum Brug. 

 .53. Potamides (Exechestoma) gampbonensis [Vass. 



