http://slugsite.us/bow/nudiwk85.html
this website exists no more:
http://www.biology.ucsc.edu/classes/bio161l/NUDI/stanya.html
http://www.medslugs.de/E/Pac-E/Sclerodoris_tanya/Selection.htm
http://www.medslugs.de/E/Pac-NE/Sclerodoris_tanya/Selection.htm
http://slugsite.us/bow2007/nudwk1155.htm