- On The Fossil Remains Of Mollusca From The Palaeozoic Formations Of The United States
- On Slaty Cleavage
- Three Papers On The Secondary Rocks And Fossils Of Portugal
- Three Papers On The Secondary Rocks And Fossils Of Portugal From The Quarterly Journal Of The Geological Society Of London, Nov. 1849. Vol. V And May 1850, Volume 6
- On The Fossil Remains Of Mollusca From The Palaeozoic Formations Of The United States Contained In The Collection Of Charles Lyell, Esq: With Remarks ... American Formations With Those Of Europe