68 [Senate 



GEOLOGICAL, INCLUDING FOSSILS. 



1847. 



Trap kock, from Essex county,. PreseBted by George W. Little. 



Clay concretions, from Schoharie county. Presented by J. W. Taylor. 



Cast of Isotelus gigas, from Trenton falls. Presented by J. W. Tay- 

 lor. 



Favosites gothlandica (the cells filled with petroleum), from Erie 

 county*. Presented by Mrs. Angel. 



Atrypa limitaris, from limestone above the Marcellus shales, from 

 Springport, Cayuga county. Presented by Mr. Allen. 



Favosites gothlandica (cells partially open), from the Oisondaga lime- 

 stone. Presented by Israel Parshall. 



Orthoceras? from limestone in the Marcellus shales, from Lenox, 

 Madison county. 



1848. 



Granite, from Haverstraw, Rockland county. Presented by J. S. 



CoNVERS. 



MEMORANDUM. 



Since the Catalogue of Fossils of the Lower Silurian Rocks, in 

 the Collection of Palaeontology, was completed, I have added three 

 casts of species described in the first volume of the Palseontology 

 of New-York : 



1. A cast of Lichas {Platynotus) trentonensis. 



The original was found at Cincinnati, Ohio-. Fragments of the same 

 have been found in the Trenton limestone of New- York. 



2. A cast of a very perfect specimen (young) of Isotelus gigas. 



3. A cast of the spinous processes of the tail of Ceraurus pleurexan- 



themus. 

 The original is of a very large individual, and very perfectly pre 

 served. 



* Also noticed under the list of Minerals. 



