Embsaygnathus crosbiei sp. nov. Jones is recorded from Arundian limestones at Newcastle, Co. Dublin, Ireland. It is suggested that E. crosbiei and Embsaygnathus asymmetricus Metcalfe were derived from the Geniculatus claviger Roundy — Geniculatus glottoides Vosges lineage.
- Received April 1, 1989.
- Accepted May 1, 1991.
- © 1991 The Micropalaeontological Society