drawing of <i><a href="//commons.wikimedia.org/wiki/Cerion_chrysalis" title="Cerion chrysalis">Cerion chrysalis</a></i>. In the source book named as <i>Strophia chrysalis</i> Fer. from Cuba.
published by George Washington Tryon, Jr.
1884
George Washington Tryon, Jr. 1884. <a rel="nofollow" class="external text" href="https://archive.org/details/structuralsystem03tryo"><i>Structural and systematic conchology: an introduction to the study of the Mollusca. Volume III</i></a>. Philadelphia, published by the author, <a rel="nofollow" class="external text" href="http://www.us.archive.org/GnuBook/?id=structuralsystem03tryo#584">Plate 100</a>, figure 16. (Cropped and retouched by <a href="//commons.wikimedia.org/wiki/User:Snek01" title="User:Snek01">User:Snek01</a>.)