Hemp "french" terry - You can see how this terry has different shaped loops to the other terry fabrics.
Image from http://www.alleco.com.au
Cotton Terry - This is the traditional fabric you would see towels & bath robes made from
Image from http://www.kushtush.com
This picture is very large, but shows great detail of the more "silky" bamboo terry. http://www.bamboofabricstore.com/images/90%25terry.gif