84 
AUG. F. FOERSTE 
Near the band the -upper surface of the last volution is concavel}^ 
curved, and a similar concave curve marks the lower surface 
of this volution, at a distance of 2 mm. from the crest of the 
Carina formed by the band. In general, the lower surface of 
this last volution has an outline similar to that of Lophospira 
peracuta, and the transverse striae follow a similar course, both 
above and below the band. A narrow umbilical opening is left 
between the inner lip of the aperture and the remainder of the 
last volution. 
liOcality and formation.^ — Quarry | mile northeast of Center- 
ville, Ohio, in the argillaceous strata immediately beneath the 
Brassfield limestone. 
Remarks. — Lophospira ehlersi has a distinctly Ordovician 
aspect. Compared with Lophospira thehesensis the spire is 
taller, and the peripheral angle is much more acute. 
Named in honor of Prof. George M. Ehlers, one of the geolo- 
gists active in collecting the gasteropoda of the lower strata in 
the Centerville quarry. 
Lophospira (Ruedemannia?) centervillensis Sp. nov. 
Plate XIV, fig. 18 
Shell 1.2 mm. in height, 11 mm. in maximum width, with the 
last volution occupying- a height of 7 mm. near its aperture. 
The apical angle is about 87°, There are 6 volutions, of which 
the apical one scarcely ever is distinctly preserved. The slit- 
band is located at the angular peripheral margin, about 0.75 
nun. beneath the level of the suture limiting the last volution. 
Above this band the surface of the volution rises only moderately 
toward the suture, while immediately below the band the outline 
of the volution is either vertical or curves slightly outward before 
curving inward toward the umbilical parts of the shell. In 
general the outline of this shell is similar to that of Lophospira 
sumnerensis (Salford), but with the peripheral angle located 
farther up on the volutions, the angulation of the spire resembling 
that of Lophospira trochonemoides Ulrich, but without any angu- 
lation along the lower part of the last volution, where the surface 
curves toward the umbilicus. 
