http://www.bbc.co.uk/programmes/articles/5n4Khbvk9fSlYyjx0SqsjwG/snails-swords-and-spiders-the-odd-origins-of-anatomical-terms?intc_type=singletheme&intc_location=arts&intc_campaign=hayfestival2018&intc_linkname=snailspider_contentcard3

oh I remember now...'ling' had decided that the 'fence' of the septum....had a couple of 'prawns' upon either side....as it goes, eh - dazzlenation?

http://www.bbc.co.uk/news/uk-england-tees-44226852

and bizarrely enough, the above...links to the following...although I am not clear as to 'why' as yet....go figure: