Double checking taxonomy of cerithium

[wateryworld]

Thanks for the links, Paul.  According to them, the vertagus we have is an albino!

Dave, honest question - how exactly are people supposed to know that?  I've seen these attributed to more than one name, how would I know which is correct?  For example, "stercusmuscarum" on one source claims that it was "cerithium muscarum, Say, 1832" and then the synonym as being "cerithium stercusmuscarum, morch, 1876".  But another claims Valenciennes as the original, one year after Say, 1833.  Like I said earlier, this is just ridiculous and it's almost like taxonomy as a science has become an absolute farce of rampant outdated/misinformation.