318 
Aug. F. Foerste 
strongly backward in the immediate vicinity of the band, in crossing 
this band the striae present a concave curvature toward the peri- 
pheral notch, and the median striation of the slit-band is almost as 
sharply defined as the limiting striations of this band. All of these 
are features in exact accordance with typical Lophospira lirata, or at 
least its variety ohsoleta. 
In searching for the features which are characteristic of the 
species Crania percarinata it is necessary to ignore those striations 
which evidently are merely reproductions of the surface character- 
istics of the Lophospira upon which the Crania rested. In searching 
for these features it is noted that the shell is marked by the concentric 
striations found in practically all Cranias. It is a part of one of 
these concentric striations, in addition to a small deformation due 
to compression, which is incorrectly figured by Hall and Clarke on 
the right side of their figure, which is so oriented as to place the 
peripheral notch on the right. Gasteropoda, however, are more 
commonly placed with the apex at the top, which would cause the 
peripheral notch to open toward the left side of the whorl. In 
addition to the concentric striae there are traces, along one margin, 
of very minute granules arranged more or less in radiating lines. 
The latter are regarded as characteristic of one Eden species, of which 
Crania percarinata apparently is the first described specimen. 
The specimen represented by figure 31, in the Hall and Clarke 
publication, evidently rested upon a Conularia, somewhere near 
its apex, where the width of one of the four faces could not have 
exceeded 3 mm. The surface of the Crania reproduces in minute 
detail the surface features of the Conularia: the longitudinal groove 
at one angle of the Conularia, the slightly concave depression along 
one of the sides of the Conularia, the sharply defined transverse 
striations rising in the form of a very broad inverted V if the speci- 
men be held with the larger end of the Conularia toward the top. 
Of these transverse striations there are about 18 in a length of 3 
mm. The short striations within the grooves between these trans- 
verse striations are at right angles to the latter and may be detected 
readily along one part of the Crania. The figure presented by Hall 
and Clarke is so oriented that if the supporting Conularia were 
present, the pointed apex of the latter would be directed toward 
the right of the figure, and the vertical groove along the angle 
should be along the lower third of the figure. 
