244 DESCRIPTION OF THE MUSEUM. 



second floor (i), and in which we must study 

 the genera and species, when we wish to be- 

 come acquainted with them independently of 

 geological considerations. 



We will now notice the most remarkable ob- 

 jects of each section. 



Amongst the zoophytes: 



i st. A beautiful stem of encrinite, from the 

 secondary limestone in the neighbourhood of 

 Brunswick. 



2d. Several polypis and echinites belonging to 

 the chalk formation in the neighbourhood of 

 Maestricht; drawings and descriptions of which 

 are given by the late M. Faujas Saint Fond, in his 

 work on the quarries of that city. 



Amongst the articulated animals : 



ist. Several fine specimens of trilobites (genus 

 ogygia of M. A. Brongniart) from the slate quar- 

 ries of Angers. 



2d. A complete specimen of a trilobite (genus 

 calymene of M. A. Brongniart) from Dudley in 

 England, presented by M. A. de Humboldt. 



3d. Several specimens of trilobites (genus caly- 

 mene) found in the transition slate of La Hunau- 

 diere, in the department of the lower Loire, 



(i) M. De la Marck has thought it necessary to bring the fossil and 

 living species together, in the collection which serves as the type of his 

 complete history of inverteb rated animals. 



