Hancockia californica  MacFarland, 1923

http://slugsite.us/bow/pan/calif.html
this website exists no more:
http://www.biology.ucsc.edu/classes/bio161l/NUDI/hancalif.html
http://slugsite.us/bow/nudwk373.htm
http://slugsite.us/bow2007/nudwk634.htm
http://www.medslugs.de/E/Pac-NE/Hancockia_californica/Selection.htm
http://www.medslugs.de/E/Pac-E/Hancockia_californica/Selection.htm
http://www.nudipixel.net/species/hancockia_californica/