98 
AUG. F. FOERSTE 
Transverse or vertical striae distinct, sharply defined, and 
equidistant. Along the peripheral part of the last volution, 
near the aperture, 8 striae occur in a width of 2 mm. Three 
millimeters below the slit-band, the number of transverse striae 
increases abruptly from 8 to 13 in a width of 2 mm., and this 
finer striation continues as far as the umbilicus. 
Along the slit-band the transverse striae curve backward so 
as to form an angle of 60° with the vertical axis; farther up they 
form an angle of 80° with this axis, and farther down their 
direction is at first vertical, with a backward curve on approach- 
ing the umbilical parts of the shell. 
Locality and Formation.^ — Near the Whippoorwill school, 
3| miles northeast of West Union, in the oolitic iron ore at the 
top of the Brassfield formation. 
Type.^ — The type specimen, used for the original description, 
was found in the oolitic iron ore at the top of the Brassfield lime- 
stone, on Todd Fork, nearly 3 miles north of the center of Wil- 
mington, in Clinton county, Ohio. 
Remarks.' — This species is characterized by the prominent 
elevation of the median part of the slit-band. In this respect it 
resembles typical Lophospira. It appears to have originated 
from a shell similar to Lophospira lirata Ulrich, from the Economy 
and Southgate members of the Eden formation in the vicinity 
of Cincinnati, Ohio. It resembles the latter in the division of 
the slope above the slit-band into two revolving concave areas, 
and in the tendency toward a faint concave area immediately 
beneath this slit-band; it is similar also in possessing revolving 
striae along the lower part of the last volution. It is dissimilar 
in having these revolving striae much more sharply defined, 
much more numerous and present above as well as below the 
slit-band. 
It would have been far better if Pleurotomaria inexpectans, 
instead of Lophospira lirata had been selected as a type of Rue- 
demannia, since it appears to be along this direction that Lopho- 
spira lirata seems to have varied. 
Pleurotomaria rohusta Lindstrom is similar to Lophospira lirata, 
in the features mentioned above. 
