Two new Echinoidea, Aulechinus and Ectinechinus , and an adult plated holothurian, Eothuria , from the Upper Ordovician of Girvan, Scotland

Abstract

This communication contains a description of species belonging to two genera of Echinoidea from the Upper Ordovician (Ashgillian) of Girvan, Scotland, namely, Aulechinus Bather and Spencer, and Ectinechinus n.g., together with a description of a new genus Eothuria , regarded as the first known holothurid, from the same locality. Some notes are added on the Middle Ordovician echinoid Myriastiches and the Silurian genera Palaeodiscus and Echinocystis . A short note upon one of the Ordovician genera, Aulechinus , was communicated by Spencer to the Annals and Magazine of Natural History , immediately after the death of Dr Bather. It contained facts which had been agreed upon by Dr Bather and Spencer, whilst working together. Dr Mortensen was anxious to include some account of the material in his new monograph, and the note was published to help him. At that time only fragments of the forms were known.