Dataset Open Access
This is a dataset collecting various tweets from twitter, sent to @rmounce that report on whether various institutional library affiliations allow the user to download the full text of this paywalled article, that is otherwise only accessible via a payment of $38 + tax:
Hincks, W. D. 1949. IV.—systematic and synonymic notes on passalidæ (col.). Annals and Magazine of Natural History 2:56-64 http://dx.doi.org/10.1080/00222934908653958
From the data given, it appears that 81 institutions do not have subscription access to this paper. 11 institutions do have subscription access to this paper.
Of the data from 41 UK-based institutions, only 3 have subscription access to this paper, namely: Cambridge, Oxford & Glasgow.
Many thanks to all those who took part in this survey and/or spread it around twitter.
A blog post was written on the basis of this informal survey data: http://rossmounce.co.uk/2015/09/16/who-actually-has-access-to-paywalled-research/