IV.—Poikilosakos, a remarkable New Genus of Brachiopods from the Upper Coal-measures of Texas

Extract

Included in a large series of marine fossils which I collected from the Cisco Beds of Uralian or Upper Coal-measure age at a well-known locality on the west bank of the Salt Creek at Graham, Young Co., Texas, are several fragments of a single very large nautiloid shell. These fragments had lain so long on the sea-floor before they were covered by mud that they have in many cases been much eaten into by sponges and worms, and are covered by adherent organisms, mostly Bryozoa. Attached to them, however, are twenty specimens of the remarkable Brachiopod which forms the subject of this paper. These specimens are in general perfectly preserved, and are easily freed from their surrounding clay by washing with a tooth-brush.