A common legend in Western North America are the skookums (skookum = strong), large tentacled animals which live in lakes. A man who visited a lake in Williamette Valley, Oregon, saw wht he described as "an orange body with two long, thin, black tentacles". the body allegedly looked like an air-sack of some kind. to me, this ceems like it may be some sort of cephalopod, or if not at least another form of mollusc which developed large tentacles. a relative of snails, perhaps?