Ayyar, Ekambaranath Ananthakrishnan <br/><br/>
Manual of Zoology ( Invertebrata ) Vol.1 / 
by Ekambaranatha Ayyar, Ananthakrishan 
 - Madras:  V. Subramanian,  1997 
 - p.422 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Zoology<br/>Chordata
<br/><br/><label>Dewey Class. No.: </label>596  / AYY-M