[98]

Sillimans J. vol. 35 p. 238. Mr Conrad says that generally shells, corals & plants which have been continued from one Epoch to another are greatly reduced in number as if from the diminished temperature. The Lucina divaricata extends from the W. Indies as far N. as Rhode Island. It originated in the Eocene period.

p. 239 says the theory of periodical refrigeration can alone explain the sudden extinction of whole races? (will this account for rarity of some present animals?) No

 

Sillimans J. vol. 35. p 247 Mr Conrad gives a brief list of fossils of transition series of N. America. also in vol. 38 p 88 list of American Silurian fossils.

 

[T. A. Conrad. 1838. Observations on characteristic fossils, and upon a fall of temperature in different geological epochs. American journal of science and art, 35: 237-249.]

 

Sillimans J. vol. 38 p. 92. Mr Conrad describes 3 species of the genus bivalve Gnathodon 2 living from Florida & G. of Mexico one fossil from Virginia. (Law of same type).

 

[T. A. Conrad. 1839. On the silurian system, with a table of the strata and characteristic fossils; Observations on the genus Gnathodon, with description of new species. American journal of science and art, 38: 86-93.]

 

Sillimans J. vol. 38. p 381 Mr Conrad says that the Zeuglodon of Harlan belongs to a formation between the Eocene & Cretaceous groups.

 

[T. A. Conrad. 1840. On the geonostic position of the Zeuglodon, or Basilosaurus of Harlan. American journal of science and art, 38: 381-382.]