“THE EURYPTERIDA OF NEW YORK 325 
Megalograptus welchi, S. A. Miller 
By A. F. FoERSTE 
Plate 58, figures 3-5 
The Richmond group of Ohio, Indiana and Kentucky includes, in 
descending order, the following divisions: 
Elkhorn beds , Liberty beds 
Whitewater beds Waynesville beds 
Saluda beds Arnheim beds 
In Ohio, most of Indiana, and a part of northeastern Kentucky, the 
base of the Liberty bed is formed by a stratum in which the brachiopod 
Hebertella insculpta is very abundant. This stratum is 
overlain by one in which Plectambonites sericeus abounds, 
and at a still higher elevation Dinorthis subquadrata makes 
its first appearance. | | 
The top of the Liberty bed is the horizon at which Gomphoceras 
cos, Gyroceras baeri, and several species of Cyrtoceras occur. 
Immediately below these cephalopoda, or associated in the same layers, 
a large form of Streptelasma rusticum is abundant. 
The Liberty beds contain an interesting fauna. Ceraurus 
miseneri, Dalmanites breviceps, Brachiospongia 
tuberculata, and various crinoids occur here including Gly pto- 
crinus richardsoni and Glyptocrinus fornshelli. 
The Liberty beds were a favorite collecting horizon for the crinoid 
hunters 40 years ago. It was while working out a pocket in which 
Dendrocrinus casei and Gaurocrinus onealli were 
abundant, that Megalograptus welchi was found. The 
locality occurs in the eastern edge of Warren county, Ohio. The road 
from Clarksville to Fort Ancient crosses Todds Fork half a mile west of 
Clarksville. A short distance beyond the point at which the road to Morrow 
turns off, on the left, is the home of Adam Pennington. The Megalo- 
graptus specimens were found about 100 yards directly west of the house, 
along a small stream. A wave-marked layer of limestone, 6 inches thick, 
overlies a few layers of hmestone containing Dinorthis subquad- 
rata. Farther down stream there are no exposures for about 25 feet, 
but it is evident from the stratigraphy worked out in the surrounding 
country, that the wave-marked layer here mentioned belongs about 15 
feet above the Hebertella insculpta horizon. The Megalo- 
_ graptus occurred in a series of crinoid-bearing clays, 3 feet above the wave- 
marked limestone. | 
