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.

[paul monfils]

Well, it's a Nassarius and a Natica, but I can't name the species for either.

[conchylinet]

Thank you Paul.
The Natica is maybe juvenile. The Nassarius is not, I have a few identical specimens.