104 DISCOVERY OF FOSSILIFEROUS STRATA OF THE 
that strata of this epoch have been identified in this 
State, with the single exception of the discovery, earlier 
in the same season, by Mr. C. D. Walcott of the United 
States Geological Survey, of fossils which he is ‘ in- 
clined to refer to the Paradoxides zone,’’ in a locality in 
Washington County. 
Fragments of these fossils abound in some of the thin 
layers at Stissing ; but good specimens are very rare, and 
have been secured only by the breaking up of a great 
deal of the rock into small fragments. Some of these 
specimens exhibit the details of the structure quite per- 
fectly. 
The list of the fossils of the Paradoxides zone ob- 
tained in excavating the rock in this locality is as follows: 
1. Hyolithes Billingsi?’—Plate —, fig. 1.—About halfa 
dozen poorly preserved tubes of a fossil, referred to this 
species, have been found here. They are from eight to 
twelve millimeters long, and from three to four in diam- 
eter at the aperture. This fossil, even if the species 
were certain, would not determine the exact epoch, as it 
has considerable range of occurrence. 
2., Leperditia ebenina—Plate —, figs. 2, 3 and 4.— © 
New species. This ostracoid has a very characteristic 
jet black, shining, sub-elliptical carapace, about eight 
millimeters in length. The exterior surface-is quite pe- 
culiarly ornamented in this way; the entire border of 
each valve, to the width of about two millimeters in the 
larger specimens, is covered with extremely minute, con- 
liguous pits, about 100 to 150 to a square millimeter. 
All the surface within this border is covered with much 
larger, separated pits, the interspaces being at least as 
wide as the pits. The disposition of these pits is quite 
irregular, but they average about 15 or 20 to the square 
millimeter. There is also a linear marginal groove along 
‘tthe ventral border. The central portions of the internal 
surfaces of the valves are covered with scattered, well- 
54 
