IV.—Sympterura Minveri, n. g. et sp.: A Devonian Ophiurid from Cornwall

Abstract

The specimen (Fig. 6), kindly entrusted to me for description by Mr. Howard Fox, consists of the oral skeleton surrounded by portions of the disc and of portions of the five rays, all seen from what is believed to be the ventral or actinal surface, and lying on a fragment of the dark slate of the locality, Epphaven. The skeletal parts being preserved in pyrites, it has proved possible to develop the specimen slightly by washing with weak hydrofluoric acid and then brushing with a soft brush. The specimen is, however, so minute and delicate that this process could not be carried very far.