<p>Fauna u. Flora d. Golfes v. Neapel. Cephalopoden Bd. 2 <br>
Taf. 23 <br>
.1. Saef del. <br>
Verlag v. R. Friedländer u. Sohn in Berlin <br></p>
J. B. Obernetler in München
Naef, Adolf
1921
<a rel="nofollow" class="external free" href="https://www.flickr.com/photos/biodivlibrary/7447814826">https://www.flickr.com/photos/biodivlibrary/7447814826</a>