Small gastropods from Indian Ocean

[conchylinet]

Dear all,
Can somebody help me with the identification of these two small species from Rodrigue is. (South-western tropical indian ocean).
They have been found beached.

A- 11 mm
<img src="http://www.conchylinet.com/Images/Misc/4292.JPG" alt="http://www.conchylinet.com/Images/Misc/4292.JPG" style="border:0" />

B- 10 mm
<img src="http://www.conchylinet.com/Images/Misc/4277.JPG" alt="http://www.conchylinet.com/Images/Misc/4277.JPG" style="border:0" />

Ta.
Conchylinet.