APPENDIX. 423 



Third Species* Turbo Polythalamus five concame- 

 rations. This shell has never been found, except fossil, 

 and in that state only one species has been known to me. 

 It is turbinated or spiral, of a lengthened shape, like a 

 buccinum, is concamerated, and the diaphragenus are 

 jogged like the Ammonite. 



J3 elemnite. 



Those in my cabinet are from James's river, Virginia, 

 and Monmouth County, New-Jersey. From Monmouth 

 County, they are found in marl pitts, near Sandy-Hook, 

 and measure from three to five inches in length, having a 

 base of half an inch, lengthened to a sharp point, con- 

 eamerated. Linnaeus classes them with Nautuli. 



Gryphite. 



I have some specimens from New- Jersey and Virginia; 

 there are several varieties ; some are grooved, and others 

 have a plain surface ; some are flattened, and others al- 

 most globular, having the apex conflected. Found in 

 marl. This animal is extinct in this country, as also in 

 Europe. 



In addition to the above described specimens, I have 

 also Corallites, Encrinites, Entrochites, Echinites, Cha- 

 mites, Cardites, &c. principally found in the State of New- 

 York. 



In addition to the list or catalogue of organic remains, 

 of which I have endeavoured to give some account, per- 

 mit me to make one or two remarks. As there is a va- 

 riety of opinions^ainong geologists on the subject of the 

 formation of Obsidian (although not exactly belonging 

 to your book on the geology of North America), I beg 

 leave to mention, that Dr. Barton, of Philadelphia, pre- 



