Hershler, Robert <br/><br/>
A review of morphological characters of hydrobioid snails / 
Robert Hershler and Winston F. Ponder 
 - Washington, DC :  Smithsonian Institution Press,  1998 
 - iii, 55 p. :  ill. ;  28 cm. 
 - Smithsonian contributions to zoology ;  no. 600 .
<br/><br/>Includes bibliographical references : p. 49-55 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hydrobiidae--Morphology<br/>Rissoidae--Morphology<br/>Snails--Morphology