Notes on Cincinnatian Fossil Types 
319 
Ignoring these surface features, which are merely a reproduction 
of those belonging to the supporting Conularia, a few concentric 
markings may be seen along the margin of the Crania, but no minute 
granulations arranged along radiating lines. 
28. Crania parallela, Ulrich 
{Plate VI, Figs. 2, 3) 
1878. Crania parallela Ulrich, Jour. Cincinnati Soc. Nat. Hist., 1, p. 98, Plate 4 , 
Fig. 13 
The types of Crania parallela, including the specimen figured 
in the original publication, belong to the collection of Prof. Charles 
Schuchert, of Yale University, and were found in the Economy 
member of the Eden group, about 100 feet above low water in the 
Ohio river, at Covington, Kentucky. 
In the figured specimen, (fig. 13 of original publication; fig. 2 
on plate VI of present bulletin) one side of the shell has been broken 
off but originally it must have been about 8 mm. in width. About 
16 nearly straight ridges cross the shell vertically. Of these ridges 
there are 14 in a length of 5 millimeters. In the narrow grooves 
between these ridges there are indications of numerous short striae 
perpendicular to the ridges, suggesting that the Crania was attached 
to a Conularia. Aside from these features, which evidently do not 
constitute a specific characteristic of the Crania, there are numerous 
very minute granules scattered quite irregularly over the surface, 
with only a faint tendency toward radial arrangement. These 
granules are regarded as characteristic of an Eden species which 
has been described under several names based on surface features 
shown by individual specimens, and which vary with the character 
of the supporting surface. 
A second specimen, B, 6 mm. in width, was attached to one of 
the faces of a Conularia. There are 12 transverse ridges in a length 
of 3 mm. These ridges meet at an angle of 130° at the middle of 
the face of the Conularia. The short vertical ridges in the grooves 
between these ridges are very plainly shown. Minute granules 
characteristic of the Crania rather than of the Conularia apparently 
may be detected. 
A third specimen, C, (figure 3 on plate 6, in this bulletin), 
6 mm. in width, is crossed at irregular intervals by moderately 
