I. SUPPLEMENT TO VOL. I. 
NOTES UPON THE GENUS GRAPTOLITHUS; 
WITH REMARKS UPON SOME OP THE SPECIES, THEIR MODE OF GROWTH, AND MANNER 
OP 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 beds 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 
first 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 Paleontology 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 GRAPTOLiTiDEiE. 
* The first volume of the Palaeontology of New-York was published in less than four years from the time 
the work was placed in my charge, and this without an assistant of any kind furnished by the 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 imperfections. 
