1844.] 391 



JMay 1, 1844. 



1. Report on the FossiJ^s from Santa Fe de 'Bogota, presented to 

 the Geological Society by Evan Hopkins, Esq. F.G.S. By 

 Professor Edward Forbes, F.L.S. 



The fossils from Bogota presented by Mr. Hopkins are all remains 

 of Mollusca. They are embedded in a very dark and compact 

 limestone; and are all, apparently, from the same formation. They 

 include 17 species, most of which are in very good preservation. 

 Of these, 9 are described species, and are identical with fossils 

 from the same neighbourhood, described in the memoir by M. 

 Yon Buch, " On the Fossils collected in America by MM. Hum- 

 boldt and Degenhardt," in the paper intitled " Notice of the 

 Oolitic Formations in America," by Mr. Isaac Lea, printed in the 

 " Transactions of the American Philosophical Society for 1841," 

 and in the account of the fossils collected in Columbia by M. 

 Boussingault, given by M. Alcide d'Orbigny, in the Palaeontology 

 of his South American Voyage, published in 1843. All these 

 papers have been consulted in the preparation of this Report. 



The formation in which these fossils were found has been re- 

 ferred by M. Von Buch to the Cretaceous era, by Mr. Lea to 

 the Oolitic period, and by M. d'Orbigny to the Neocomian epoch 

 of the Cretaceous era. The result of an examination of Mr. Hop- 

 kins's specimens, more especially of such as are new, bears out the 

 view of their cretaceous origin first taken by M. Von Buch, and 

 afterwards adopted by M. d'Orbigny. It is probable, however, 

 from the number of forms approximating Cault species, that the 

 last-named palseontologist has placed them too low in the Creta- 

 ceous series, when he refers them to the Neocomian, or, in other 

 tei'ms, the lower part of the lower greensand strata. 



Accompanying the shells is a specimen of coal, stated by Mr. 

 Hopkins to be found in the same formation. The species in the 

 Society's collection are mostly Cephalopoda ; they consist of 10 

 Ammonites, 1 Ancyloceras, and 2 Hamites ; these are accompanied 

 by 1 Rostellaria, 1 Venus, 1 Lucina, and 1 Inoceramus. 



Descriptive List. 



Ancyloceras Humholdtiana. (Orthocera Humboldtiana Lea, loc. cit. p. 253. 

 pi. viii. f. i.) 



This is apparently a good (though not quite perfect) specimen of the 

 fossil described by Mr. Lea as an Orthoceras, from a fragment. The turns 

 of both extremities are seen in Mr. Hopkins's specimen. 



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