420 APPENDIX. 



otherwise impressed, than that this region has, at some 

 very remote period, been covered with water, as the 

 country generally is alluvial. Upon examination of a 

 great part of this country, I found the course of the wa- 

 ter, directed towards the Hudson, falling in many places 

 over high precipices, and the rocks very much water 

 worn. On the easterly side of this range of mountains? 

 which divides the state of Massachusetts from New- 

 York, the water empties into the Sound or East river. 



A 



Terebratulite. 



Gaultieri, in his book, has made a particular genus for 

 the Terebratulites, and calls them Terebratula. Lin^ 

 naeus calls them Anomia. 



Davila ranks them as a genus of his first family of 

 Ostrea. The break on the top of the under valve is perfo* 

 rated, and rises curved upon the upper valve ; the hinge 

 is inarticulate. 



The second species of this family is multarticulate ; the 

 hinge lying on a long straight line, and set with teeth 

 like the arc shell. 



The specimens I have, are from the Ohio falls, Black 

 river, Jefferson, Ontario, Oneida, Columbia, Rockland, 

 and Orange Counties, State of New-York. 



These remains are rarely found recent, and differ much 

 in their external figure ; some are globular, and others 

 elongated. 



Area Noe and Area Tortuosa. 



These specimens I procured from the Wallkill, Orange 

 County, State of New- York ; they are imbedded in in- 



