Published in Proc. Acad. Nat. Sci Philadelphia, in 1857, in volume 1857, pages 195-199

Published in Proc. Acad. nat. Sci. Philad., in 1857, in volume 9, pages 181-182

Published in Proc. Acad. Nat. Sci. Philadelphia, in 1857, in volume 9, pages 215

Published in Proc. Acad. Nat. Sci. Philadelphia, in 1857, in volume 9, pages 48-72

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1857, in volume 8, pages 306-310

Published in Proceedings of the National Academy of Sciences of Philadelphia, in 1857, in volume 1857, pages 159-165

Published in Proc. Acad. Natur. Sci. Philad. (1856), in 1857, in volume 8, pages 165-213

Published in Proceedings Academy Natural Sciences Philadelphia, in 1857, in volume 1857, pages 87-88

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1857, in volume 9, pages 1-16

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1857, in volume 9, pages 101-104

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1857, in volume 9, pages 176-177

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1857, in volume 9, pages 74

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1857, in volume 9, pages 107-109

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1857, in volume 9, pages 205-210

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1857, in volume 9, pages 149

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1857, in volume 9, pages 73