M. B. Lewy's Expedition to New Granada. 133 



vast limestone formation of the acclivities of the Cordilleras, 

 and constituting the subroek of the valley of the Magdalena, 

 are Neocomien. 2. The greater part of the metallic minerals, 

 viz., the Galena of Ubate, the fer oxydule of Santa Rosa, the 

 native gold and silver ore, appear to exist in a zone of the 

 limestone, which marks the separation of Muzo and the crys- 

 talline rocks of the chain of the Cordilleras. 



« 



Zoology. 



The collection of birds made at Santa Fe de Bogota is truly 

 magnificent. It contains, at least, 285 species. The collec- 

 tion of Humming-birds is extremely beautiful. In the class 

 of Reptiles there are many interesting specimens ; and among 

 these there is a large tortoise which forms a new species, 

 named Podocnemis Lewyanus. Mr Lewy also brought from 

 Magdalena two young Crocodiles of the species Crocodilus 

 acutus, Cuv., which are thriving in the menagerie of the 

 Garden of Plants. 



Humboldt, in the Memoirs of the Institute for October 

 1806, gave an account of two remarkable fishes from the 

 river of Bogota. One of them, known in the country under 

 the name of Capitan, was distinguished by Cuvier as a new 

 genus, which Humboldt named Eremophilus. Of this animal 

 a number of specimens presented by Mr Lewy to the mu- 

 seum, will enable anatomists to give a detailed account of 

 the anatomy of this animal. The second species, from Bo- 

 gota, is a small fish called Guapucha, about which much 

 uncertainty prevails ; this will now be removed by the exami- 

 nation of many specimens presented to the museum by Mr 

 Lewy. 



The river Magdalena afforded many species of fishes, par- 

 ticularly of the Siluridse. These are well represented in Mr 

 Lewy'*s donation to the museum. 



The collection of Insects made by Mr Lewy contains many 

 interesting and important novelties : the collection of Shells 

 and their animals is very instructive. The collection of 

 Fossils from the Neocomien rocks of the table-land of Bo- 

 gota, is valuable in a paloeontological point of view. 



Lastly, the collection of the Bones of Mastodons have 



