1. Conodonts are rare in the Scottish Carboniferous
Limestone but are slightly more abundant in the lower
Dart of the Scottish Millstone Grit.
2. Seventeen genera and 53 species (including one
new genus, Dalryella, and 21 new species) of conodonts
are recognised and described.
3. Apart from Gnathodus carinatus, confined to the
Lower Limestone Group, and G. smithi; indicative of the
upper part of the Upper Limestone Group, conodonts have
been found unsuitable for stratigraphic discrimination
within the Carboniferous Limestone.
4. Two genera, Idiogn.athodus and Streptognathodus,
diagnostic of the Pennsylvanian of N. America first
appear near the horizon of the well -known palaeontological break in the lower part of the Millstone Grit
thereby strengthening the evidence for correlating this
break with the American Mississippian /Pennsylvanian
5. The range of Apatggnathus must be extended from
the top of the Devonian to near the top of the Upper