Westergren, A. M. <br/><br/>
Echini  : echnoneus and micropetacon 

 - Cambridge :  Printed for the Museum,  1911. 
 - 68p.  : ill.  ; 31cm. 
 - Memoirs of the museum of compeartive zoology at Havard College. .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Echnoneus<br/>Micropetalon
<br/><br/><label>LC Class. No.: </label>QTO QL1.H35 V29 no.2