1. I ntroduction
2. The little fish Palaeospondylus gunni from the M iddle Devonian of Achanarras
3. Caithness is perhaps the most widely known of all problem atical fossils. Ever since
4. it was first described by T raquair in 1890 it has attracted the attention of a very
5. large num ber of workers. Nevertheless its affinities have not yet been convincingly