1. The Eurypterida of New York;Clarke,1912
2. Note on the Eurypteridæ of the Devonian and Carboniferous Formations of Pennsylvania;Hall;2nd Geol. Surv. Pennsylvania, Rep. Progress,1884
3. Ueber die Crustaceen der Steinkohlenformation von Saarbrücken;Jordan;Palœontographica,1856