Need help to identify Costa rica Pacific shell....beginner issue

[Argonauta]

Hi Paul, Thanks again for to share your knowledge.
I would try to have some more help in the identification of some other shells I found in my area.here the links to the pictures, and excuse me if they are similar to the first ones , in term of wrong angle, but , I swear, the next ones will fit your counsels....

<!-- m --><a class="postlink" href="http://www.badongo.com/pic/13028459">http://www.badongo.com/pic/13028459</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.badongo.com/pic/13028458">http://www.badongo.com/pic/13028458</a><!-- m -->

<!-- m --><a class="postlink" href="http://www.badongo.com/pic/13028457">http://www.badongo.com/pic/13028457</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.badongo.com/pic/13028456">http://www.badongo.com/pic/13028456</a><!-- m -->

<!-- m --><a class="postlink" href="http://www.badongo.com/pic/13028452">http://www.badongo.com/pic/13028452</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.badongo.com/pic/13028451">http://www.badongo.com/pic/13028451</a><!-- m -->

<!-- m --><a class="postlink" href="http://www.badongo.com/pic/13028400">http://www.badongo.com/pic/13028400</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.badongo.com/pic/13028398">http://www.badongo.com/pic/13028398</a><!-- m -->

...and by the way, about Trivias, are more common the Solandri Or the Radians ?

Thanks again for your help

Bests