988 THE PALEONTOLOGY OF MINNESOTA. 



LLopliosplra 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. 



LOPHOSPIEA AUGUSTINA, Var. MINNESOTENSIS, . VdT. 

 PLATE LXXI, PIGS. 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 (PI. LXXIII, 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. Maclurea bed of the Trenton group, Stewartville, Minnesota; Ottawa, 

 Canada. 



Collections. Geological and Natural History Survey of Minnesota; E. O. Ulrich. 

 Muteum Register, Nos. 7389, 8726. 



LOPHOSPIRA (?SEELYA) LIHATA, n. sp. (Ulrich.) 



PLATE LXXII. FIGS. 50-S9. 



Hight 15 to 24 mm.; apical angle 65 to 70, the angle of the first three whorls usually a little 

 wider. Volutions about flve and a half, ventricose, the carinao 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 tlie 

 Trenton limestone at Ottawa, Canada. E. O. ULKICII. 



