GEOLOGICAL COLLECTION. 245 



by M. Regley, assistant naturalist, and given by 

 him. 



4th. A very distinct limulus, a precious speci- 

 men, long since described by Walch and Knorr. 

 It was found in the secondary limestone of Pap- 

 penheim, and a good representation of it may 

 be seen in the work of MM. Brongniart and 

 Desmarest. 



5th. A large palinurus contained in the tabular 

 limestone of Monte Bolca. 



Amongst the mollusca : 



i st. Several hippurites and orthoceratites of 

 a large size, from the ancient limestone beds 

 of lake Erie, in the United States, and from the 

 northern side of the Pyrenees. 



2d. Radiolites, partly siliceous, and dicerates 

 collected in the more recent limestone beds of 

 the island of Aix, in the department of the Lower 

 Charente, by M. Dorbigny, correspondent of the 

 Museum. 



3d. Nautilithes and ammonites, the shells of 

 which have preserved their pearly lustre. TJiey 

 are from the sandy clay formation above the 

 chalk. The greater number were given by 

 M. Crow, and come from Sheppy in England. 



4th. The cast of a gigantic ammonite of whose 

 locality we are ignorant, but which probably 

 comes from the lower part of the chalk formation 



