Help to identify - total newbie

[birdy59]

Hi, I have three shells that belonged to my parents and I was wondering what they are? So if anyonw can identify it would be much appreciated.

<img src="http://www.homedia.co.uk/IMGP3716.jpg" alt="http://www.homedia.co.uk/IMGP3716.jpg" style="border:0" />

<img src="http://www.homedia.co.uk/IMGP3717.jpg" alt="http://www.homedia.co.uk/IMGP3717.jpg" style="border:0" />

Thanks,
Michael