On Gill-like Structures in the Eurypterida

Abstract

The nature and arrangement of the “gills” of Eurypterids is not known in detail. A specimen of Slimonia in the Sedgwick Museum (No. A16237a), figured by Laurie (1893, pl. 1, figs. 5, 6, p. 514), seems to show their structure and segmental arrangement better than any described elsewhere. Owing to the rather poor quality of Laurie's figure and to the important conclusions which follow a study of this specimen, it has been thought fit to re-describe it here.