984 THE PALEONTOLOGY OF MINNESOTA. 
([Lophospira perforata. 
concave above the lower carina; upper slope moderately concave in the outer 
part; umbilicus very small, sometimes apparently covered by the reflected inner 
lip. Surface with transverse and revolving lines, the former curving strongly 
backward toward the peripheral band and consisting of two sets, one lamellar 
with distant raised edges, the others exceedingly fine, parallel with the other 
set, and five or six times as numerous. The whole surface, including the 
peripheral band, is covered with the revolving lines which are inclined to be 
irregular and more delicate even than the transverse set, requiring a good light and 
a magnifying power of no less than four diameters to be clearly visible. On the 
peripheral band the lunule are distant and strongly curved backward. 
Differs from the earlier L. spironema in having the basal part of the last turn 
slightly more ventricose, the carine less strong, the peripheral band rounded instead 
of sharp, and the surface markings more delicate excepting the sublamellose growth 
lines which are wanting in that shell. L. pulchella also resembles it greatly but has 
a smaller apical angle and so far as observed its surface is entirely without 
revolving lines. 
The extreme delicacy of the surface markings renders them unusually liable to 
removal through maceration and weathering. The best examples were obtained by ~ 
picking away the thin parasitic bryozoan, Leptotrypa clavis Ulrich, which frequently 
covers this and other fossils of the Utica group. Without the characteristic surface 
ornamentation L. tenuistriata might be confounded with the young shells of the 
Utica form of L. owent. In such cases, however, the presence of a lower carina in 
the tenuistriata and its absence in the owen? will usually suffice in distinguishing them. 
We have before us two imperfect specimens, collected by one of the authors in 
the Stones River group at High Bridge, Kentucky, of another species of Lophospira 
with spiral lines. It is larger than either of the two of this type described in this 
work, and differs from them besides in having the revolving lines coarser and in 
wanting the lower carina. The general shape and character of the shell seems to 
have been very similar to our L. medialis. 
Formation and locality.—Shales of the Utica group, Cincinnati, Ohio, and Newport and Covington, 
Kentucky. 
Collection.—E. O. Ulrich. 
LOPHOSPIRA PERFORATA, 2. Sp. 
PLATE LXXIII, FIGS. 32—35. 
Murchisonia bicincta? MEEK and WorTHEN, 1868, Geol. Sur. Ill., vol. iii, p. 317, pl. m1, fig. 4. (Not 
M. bicincta HAty, 1847.) 
Hight 33 mm.; greatest width 26 mm.; apical angle about 50°. Volutions six 
or seven, relatively depressed, with the hight and width, as shown in a transverse 
