Illustrations accompanying Bartholin's commentary on the siren (mermaid) <i>Historiarum anatomicarum</i> <b>II</b> (1654). 
The upright "siren" in the picture, though appearing female, is that described in the text as "<i>homo marinus</i> (sea-man)" captured in Brazil by merchants of the West India Company, and dissected at Leiden by Petrus Pavius (<a href="https://en.wikipedia.org/wiki/Pieter_Pauw" class="extiw" title="en:Pieter Pauw">Pieter Pauw</a>), with <a href="https://en.wikipedia.org/wiki/Joannes_de_Laet" class="extiw" title="en:Joannes de Laet">Joannes de Laet</a> also present: its "head and the breast even as far as the navil(sic.) was of an humane shape, but.. without the sign of a tail". Bartholin came into possession of the skeletal hand and rib (figures right) through his friend, de Laet.<sup id="cite_ref-Bartholin—1654——_1-0" class="reference"><a href="#cite_note-Bartholin%E2%80%941654%E2%80%94%E2%80%94-1">[1]</a></sup><sup id="cite_ref-webster_2-0" class="reference"><a href="#cite_note-webster-2">[2]</a></sup><sup id="cite_ref-broedel_3-0" class="reference"><a href="#cite_note-broedel-3">[3]</a></sup>
Thomas Bartholin
<cite class="book" style="font-style:normal" id="Reference-Bartholin-1654">Bartholin, Thomas (1654) "Historia XI. Sirenis seu Marini Hominis Anatome" in  (in Latin)  <i> <a rel="nofollow" class="external text" href="https://books.google.com/books?id=2dxyQqZGEh4C&amp;pg=PA186">Thomae Bartholini historiarum anatomicarum rariorum centuria (I et )II</a></i>, <a href="https://en.wikipedia.org/wiki/en:Copenhagen" class="extiw" title="w:en:Copenhagen"><span title="capital city of Denmark">Copenhagen</span></a>:  typis academicis Martzani, sumptibus Petri Hauboldt bibl., p. <a rel="nofollow" class="external text" href="https://books.google.com/books?id=2dxyQqZGEh4C&amp;pg=PA188-IA1">188a</a>  <small></small></cite>