Harmer, S F, Ed., Shipley, A E, Ed. <br/><br/>
Cambrigde natural history, Vol.01: Protozoa, Porifera, Coelenterata and ctenophora, Echinodermata 

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 - Wheldon and Wesley Ltd., England  1968 
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<br/><br/><label>ISBN: </label>  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural history of animals
<br/><br/><label>Dewey Class. No.: </label>591  CAM.01