Nerita,Oliva,Ancillia and other need identification

[j.de sousa]

for some I am not sure others I don't know so if you could help and please tell me your sources for their identification thanks you.here the link for the pictures <a href="http://www.badongo.com/pic/7621104" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/7621104">http://www.badongo.com/pic/7621104</a><!-- m --></a> next ones are numbers 7621235,7621213,7621131,761118,7621194,7621146,7621721,7620881 and this last one is Nerita quadricolor to compare with  the two Nerita from Zanzibar these last two the parietal region are lisse no lirae folds.