i.v.i 



I. SUPPLEMENT TO VOL. L 



NOTES UPON THE GENUS GBAPTOLITHUS ; 



WITH REMARKS UPON S0»£ OF THE SPECIES, THEIR MODE OP GROWTH, AND MANNER 

 OF REPRODUCTION OR GERMINATION. 



The short time allowed, and the limited means at my disposal, for the 

 investigations and collections for the first volume of the Palaeontology of 

 New- York, prevented that careful and continued examination of many of 

 the fossiliferous heds which becomes so desirable in the present state of 

 the science and the requirements of geology*. Notwithstanding this, 

 however, fifteen species of Graptolites were determined, ten of which 

 were at that time new ; while of those identified with European species, 

 we may still raise the question as to positive specific identity, and, with 

 the addition of new material, the subject at this time requires a thorough 

 revision. At that time the peculiar branching forms of the genus were 

 fiftt made known, and, so far as I am aware, a greater variety of form 

 and character illustrated than had previously been observed. 



Two other species from the Clinton group were described in the second 

 volume of the Palaeontology of New- York, one of these being referable 

 to the Genus Gladiolites. In the same volume I described the Genus 

 DiCTYONEMA, referring it to the Family Graptolitide^. 



* The first volume of the Palaeontology of New- York wag published in less tlian four years from the time 

 the work was placed in my charge, and this without an assistant of any kind furnished by tlie State; and 

 the entire collections, except a small number previously in the State collection, were made at my private 

 expense. This state of things, and the comparatively imperfect knowledge of the rocks at that time pos- 

 sessed by every one, may offer some excuse for many omissions and some imi>erfections. 



