982 THE PALEONTOLOGY OF MINNESOTA. 
[Lophospira (?) trochonemoides. 
LopHOSPIRA PULCHELLA, ”. Sp. 
PLATE LXXIII, FIGS. 46—48. 
Hight 8 to 15 mm.; apical angle 46° to 50° in the Richmond group variety 
and 50° to 56° in the Trenton types of the species; volutions angular, six in the 
latter and seven in the former. Peripheral band prominent, trilineate; upper or 
subsutural carina small and close to the suture, constantly present; lower carina 
obtuse, yet very distinctly defined by the concave band between it and the 
peripheral keel. Base of volutions somewhat flattened; umbilicus very small, closed 
entirely in the Richmond group variety. Growth lines as in L. perangulata and 
L. medialis, from both of which it is readily distinguished by the upper carina, those 
species being without that feature. 
The development of an upper carina brings this species into closer relations 
with L. oweni and L. saffordi than it holds with the two species mentioned in the 
foregoing paragraph. The absence of the umbilical swelling and the small size of 
L. pulchella will of course suffice to distinguish it specifically from these. JL. 
spironema and L. tenuistriata are exceedingly like it to the unassisted eye, but with 
the aid ofa magnifier good specimens may be distinguished at once by their surface 
markings, the present species having lines of growth only, while both of the others 
have revolving lines as well. DL. pulchra McCoy resembles this species very greatly, 
yet, relying on the accuracy of McCoy’s illustrations, we see at once that his species 
is a member of the Bicincta section and not, as is the case with L. pulchella, of the 
Perangulata section. Indeed L. pulchra seems to be uncomfortably near certain 
varieties of L. bicincta. 
Formation and locality.x—Upper part of Trenton group, Burgin, Danvilleand Frankfort, Kentucky; 
Black River group, Ctenondonta bed, near Cannon Falls, Minnesota; Richmond group, Spring Valley, 
Minnesota. (Over 30 specimens.) 
Collections.—Geological and Natural History Survey of Minnesota; E. O. Ulrich. 
Museum Register, No. 7383. 
LopHosPIRA SAFFORDI, . sp. (Ulrich.) 
Hight 23 to 33 mm.; apical angle 59° to 65°. Volutions seven, very 
angular, the peripheral band unusually prominent, upper and lower keels both 
distinct; upper carina removed a third of the width of the upper slope from the 
suture; surface of whorl lying between the three keels decidedly concave; umbilicus 
small, rather abrupt, the surface between it and the lower carina either flat or 
slightly concave. Aperture quadrate, or it might be called subtriangular, moder- 
ately produced below, the inner lip nearly vertical, broadly reflexed. Surface 
markings consisting of unequal sublamellose lines of growth, sweeping backward 
very strongly to the peripheral band. 
