Subject: Marine Biology -- Crustaceans

I am doing a report on Crustaceans (particularly barnacles, amphipods, 
isopods, crabs and horseshoe crabs). I am trying to find internet sources 
that are detailed, yet easy to understand--and am getting frustrated 
looking. (It seems they are either too simplistic or too technical and 
difficult to understand.) 
Do you know of any sites that I might be able to access?  Thank you for 
your help.

Re: Marine Biology -- Crustaceans