988 THE PALEONTOLOGY OF MINNESOTA. 
|Lophospira augustina. 
as a variety of Murchisonia, or, as it should now be called, Hormotoma bellicincta, but 
relying on the accurracy of his description and figure, this cannot be so, since the 
angular whorls and convex band remove his augustina far from Hormotoma in which 
the band is concave or flat and the whorls nearly always rounded. In our opinion 
the species is related to Lophospira bowdeni Safford sp., differing therefrom chiefly in 
the lesser angularity of its whorls. Of course it is not likely to be confused with 
that species, being a much larger and relatively wider shell. 
Formation and locality.—Maclurea bed of the Trenton group, Stewartville and other localities in 
southern Minnesota. Billings’ types are said to be from divisions H, I, K, L, M, N, of the Quebec group, 
at Pistolet bay, Burnt cape, Table head, and Point rich, Newfoundland. 
Collections.—Geological and Natural History Survey of Minnesota; E. O. Ulrich. 
Museum Register, Nos. 7345, 7478. 
LOPHOSPIRA AUGUSTINA, Val. MINNESOTENSIS, ”. var. 
PLATE LXXI, FIGS. 3 and 4. 
Hight 80 to 120 mm., apical angle 36° to 45°. 
Of this supposed variety we have only three casts of the interior which one of 
the authors found in the same block of limestone from which he extracted a number 
of good casts of L. augustina, and three fragments belonging to the Survey collec- 
tion.* The obtuse angulation of the whorls, which marks the position of the band, 
is lower than in the typical form of the species and the whorls are on the whole less 
convex, the result being a more conical form, probably not greatly unlike, externally, 
L. conoidea (Pl. LX XIII, Fig. 22). Continuing our comparisons with L. augustina we 
find that the under side of the whorls is also less ventricose and the total hight of 
each somewhat less. ; 
In the absence of any knowledge of the external markings, we prefer to rank 
this form as a variety though strongly inclined to believe that it will prove specifi- 
cally distinct. 
Formation and locality.x—Maclurea bed of the Trenton group, Stewartville, Minnesota; Ottawa, 
Canada. 
Collections.—Geological and Natural History Survey of Minnesota; E. O. Ulrich. 
Museum Register, Nos. 7389, 8726. 
LopHospira (?SeELYA) LiRATA, ”. sp. (Ulrich.) 
PLATE LXXII, FIGS. 56—59. 
Hight 15 to 24 mm.; apical angle 65° to 70°, the angle of the first three whorls usually a little 
wider. Volutions about five and a half, ventricose, the carinse not greatly interfering with the general 
roundness of their outlines. Peripheral band median, appearing lower on the whorls of the spire, very 
slightly prominent, trilineate, the lines of equal strength and elevation or the median one is a little 
* Since the above was written, I have received a specimen of this variety from Mr. W. R. Billings, who found it in the 
Trenton limestone at Ottawa, Oanada. E, O. ULRICH. 
