Fossil Footsteps. 175 
the liberty to subjoin a catalogue of all the species hitherto discov- 
ered, according to a more comprehensive arrangement, which further 
discoveries have rendered necessary. And even the classification 
which I now propose, will probably require other modifications. 
I arrange all the footmarks under the general term 
Tounites, (vos and Aidog.) 
The subdivisions are three. 
1. Tetrapodichnites, (rsrparss, &c.) 
*T. didactylus. On graywacke, New York. 
2. Sauroidichnites, (couvpos, sidog, &c.) 
*S. Barrattii.. Dedicated to Dr. Joseph Barratt of Middletown, 
its discoverer. Toes, 
S. palmatus. (Ornithichnites palmatus of my first paper.) 
*S. polemarchius, (xoAcuapysios. ) 
*S. tenuissimus. 
i O it dey Eee 
és) a ane 
O. giganteus. 
O. tuberosus. 
*O. parvulus. 
*Q, parallelus. (O. tuberosus, « dubius of my first paper.) 
*O. divaricatus. 
*©O. cuneatus. Discovered and named by Dr. Barratt. 
(2.) Leptodactyli. 
O. ingens. 
#Q, robustus. (O. ingens, « minor of my first paper.) 
0. diversus. 
a clarus. 
8 platydactylus. 
=). Deanii. Dedicated to Dr. James Dean of Greenfield. 
