Other
Black Hills Institute of Geological Research, Inc.: Crinoids
Site provides a detailed overview of crinoids, more commonly referred to as "sea lilies" and "feather stars." Content includes a focus on the animal's endoskeleton, feeding, commensalism, habitat, value, forms, and more. Also has great...
Tree of Life Project
The Tree of Life Web Project: Crinoidea
This site from the University of Arizona provides a very thorough information on chrinoidea, including diagrams and pictures.
Other
Wet Web Media: Crinoids
A great site on everything you need to know about crinoids, including species, types, environmental conditions, ecosystems, and pictures.
Microscopy UK
Microscopy Uk: Growth of a Starfish
Describes the growth and development of a starfish.
Indiana University
Indiana Univ. Bloomington: Geo Notes: Crinoids: Ancient Versus Modern Forms [Pdf]
Presents some facts about crinoids, a marine animal abundant during the Paleozoic Era, with many fossil species present in Indiana. This animal can still be found in the Caribbean Sea today.
California Academy of Sciences
California Academy of Sciences: Echinoderm Webpage
Resource provides a brief overview of echinoderms. Includes pictures and links for more information.