None such as you describe in the BSS Register - thought there is are a few Roman hemispherical dials in Britain. There are two semi-cylindrical stone scaphe dials on either side of a tombstone in Suffolk UK. They are dated 1725 though. The upper edge of the the scaphe lies on the polar axis and casts the shadow. They are also mentioned in Chris Daniel's Shire Album No 176 "Sundials" p29
Patrick
