Dear all,

In my library is the following item ex-libris C.M. Yonge:

Dyson, David, The land and fresh water shells of the districts around
Manchester, etc.
pp. xi + 95.  Publisher: J. Harrison, Manchester, 1850.  12o.

This is apparently a rather rare item as there is not a copy at either the
Smithsonian or Harvard libraries.  My guess is that this is likely to be
the same Dyson of the patronyms of Reeve et al.  Unfortunately I recently
moved residence and do not have the work readily available for perusal.

Regards,
Scott Jordan