PIKE, F H <br/><br/>
Some possible ancestors of vertebrates in Protostomia.  [electronic resource] 

 -  The Anatomical record  Aug 1948 
 - 728 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0003-276X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Animals<br/>Vertebrates