Ayyar, M. Ekambaranatha and Ananthakrishnan, T. N. <br/><br/>
A Manual of Zoology 
Volume I Invertebrata Part 1 (Protozoa to Annelida) 
 - Madras  S. Viswanathan (Printers & Publishers) Pvt. Ltd.  1954 
 - 466 
<br/><br/><label>Publisher. No.: </label> Higgindothams Ltd 
<br/><br/><label>Subjects--Personal Names: </label> Zoology 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Zoology