eurypterus.
PPP. 29
other evidence in a fragment of a large somite which is too imperfect to be usefully illustrated. The specimen, Fig. 10, presents the inner surface of a fragment of some large crustacean, which is broken and incomplete along the upper margin, as shown in the figure. This may, perhaps, have been a portion of a large ectognath of some sp)ecies of this family.
In addition to the above mentioned forms, Mr. C. E. Beecher has placed in my hands for description a well-marked species of Eurypterus from a sandstone of the Chemung group at Warren, Pennsylvania. This species is the first one noted from this horizon and is of considerable interest.
