Buchsbaum, Ralph Morris,  1907- <br/><br/>
Animals without backbones :  an introduction to the invertebrates / 
by Ralph Buchsbaum 
 - Harmondsworth :  Penguin Books,  1951 
 - 204 p . :  ill., ports. ;  18  cm. 
<br/><br/>'Further knowledge': p. 346-376 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Invertebrates