Page 123, for Middle Louth Seam read Middle Lount Seam. The quartzite pebble described was exhibited at the Geological Society on 22nd April, 1925 (Proc. Geol. Soc., Q.J.G.S., lxxxi, 1925, p. cxxiv), and has since been presented to the Museum of Practical Geology, Jermyn Street.
Page 143, line 9 from bottom, for J. P. Paul read F. P. Paul.
Page 143, line 7 from bottom, for endialite read eudialite.
Page 143, line 7 from bottom, for Shannon Pier read Shannon Tier.