Can you help me with this two microshells, both around 7 mm
a. Found on the France atlantic coast. Looks like a columbellid shell, but I can't find it in the books
http://www.badongo.com/pic/809108 frontside
http://www.badongo.com/pic/809092 backside
c. For certain a cerithid , bittium? but which?
http://www.badongo.com/pic/809097
http://www.badongo.com/pic/809112

Jan

Don't recognize the columbellid. The other one looks like Pyrenella conica (Blainville, 1826).

Thank you. The Pyrenella clue sends me in another direction. I've seen some pictures at Hardy. One of them really looks like this shell. But I'm not sure. The finding place is Red Sea, so this fits.
About the supposed Columbellid: Your respond suggests that you, without knowing the species, also think it must be placed in this family. I have some other shells, looking very like this one, but in white collor. But I can't fit them with other European collumbellids. Mysterie rests.