306 
Aug. F. Foerste 
Ctenodonta lorrainensis by the relatively greater length of the 
shell, compared with its height. 
Locality. Ctenodonta lorrainensis occurs along the creek, north- 
east of the bridge at the eastern edge of the village of Lorraine, 
New York. The same species is even more abundant where the 
road to Worthville crosses the creek, two miles west of Worth- 
ville, and since the latter are best preserved, they are chosen as 
types. 
Similar nearly rotund specimens of Ctenodonta occur in Cana- 
dian strata referred to the Lorraine. The valves appear to be 
slightly more convex; the hinge area, a little higher; and the teeth 
a little stronger and more erect, but the differences are slight. 
An excellent cast of the interior, numbered 2083, was collected on 
the Richelieu River, at Chambly, in 1881, by A. H. Foord. It is 
associated in the same rock fragment with Pholidops suhtruncatus, 
Protowarthia cancellata, and Glossograptus quadrimucronatus- 
approximatus. Similar specimens occur at St. Hilaire in the ditch 
along the road leading off southeastward from the station. The 
exposures are about half a mile distant from the railroad. 
38. Lyrodesma poststriatum, (Emmons) Hall 
{Paleontology of New York, vol. I, Plate 82, Figs. 10 A, B, 1847) 
Lyrodesma poststriatum was figured by Emmons among Utica 
fossils from Jefferson county, apparently because he had found 
this species associated with Triarihrus. If so, he found his type 
at a much lower horizon than the large specimen figured by Hall, 
from Pulaski, a short distance south of that county. At Pulaski 
it occurs beneath the railroad bridge and also at the Trinucleus 
horizon, several hundred yards west of the bridge. It occurs 
northeast of the bridge within the limits of the village of Lor- 
raine; also at Worthville, and two miles west of Worthville, where 
the road to Lorraine crosses a creek. It is found at a higher 
horizon at the power house at Bennett bridge, a little over a 
mile west of Salmon River Falls, and also half a mile eastward, 
a short distance below the level of the base of the falls. 
In the large specimen figured by Hall, the upper part of the 
anterior outline is more rotund; apparently four simple plications 
occur above the umbonal ridge, followed by several fascicles of 
