1076 THE PALEONTOLOGY OF MINNESOTA. 



[Fusisplra Intermedia. 



artville, WykofE and other localities. Hall's type came from De Pere, Wisconsin; Whitfleld had it from 

 Waupun and West Jefferson, in the same state; while Meek and Worthen's types are from Carroll county, 

 Illinois. 



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

 Museum Register, Nos. 286, 7390, 7407, 7428, 7472, 7481, 7495, 8390. 



FUSISPIRA INTERMEDIA, H. Sp. 

 PLATE LXXX, FIGS. 19-21. 



This species is closely related to F. inflata, but as shown in our figures, has a much smaller body 

 volution, and relatively higher spire, giving on the whole a much narrower shell. The inner outline of 

 the aperture also is different, while the whorls are much less convex, and the shell smaller. The apical 

 angle increases with growth from about 37 to 45. 



Formation and locality. Maclurea and Fusispira beds of the Trenton group, Stewartville and nine 

 miles south of Cannon Falls, Minnesota. 



Collections. Geological and Natural History Survey of Minnesota; E. O 01 rich. 

 .Museum Register, No. 7461. 



FUSISPIRA SUBBREVIS, n. sp. 



PLATE LXXX, FIGS. 1116. 



This form also Is related to F. inflata but may be distinguished at once by the fact that its whorls 

 are coiled so that the apical angle, instead of becoming wider with the growth of the shell, remains about 

 the same for the whole spire. The spire also is not so acute in its upper part, the apical angle being about 

 50, while it is only about 45 for the first four or five whorls of F. inflata. The differences mentioned 

 result In forming a shell that is also much narrower across the middle. F intermedia has a more elevated 

 and slender spire. 



Formation and locality. Fusispira and Maclurea beds of the Trenton group, thirteen miles south of 

 Cannon Falls, and Stewartville, Minnesota; Decorah, Iowa. 



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

 Museum Register, Nos. 7362, 8728. 



FUSISPIRA SCHUOHERTI, n. sp. 



PLATE LXXX, FIG. 1. 



Shell subfusiform, consisting of about six or seven gradually increasing, depressed-convex volutions; 

 aperture very narrow, oblique, lenticular in outline, its hight forming rather less than two-fifths of the 

 length of the shell; body whorl contracting very gradually; columella thick, involute; test very thick, 

 causing the suture, which is not very distinct on the exterior, to be very deep and open in casts of the 

 interior. Both cast and shell exhibit, the latter the more distinctly, a limited number of distant 

 revolving lines. 



This species is widely removed from the preceding forms by its heavy shell. It is a very interesting 

 form, and we regret that we cannot devote more space to its discussion. The specific name is to remind 

 us of Mr. Charles Schuchert, one of our colaborers on the paleontology of Minnesota, who discovered the 

 only specimen known. 



Formation and locality. Black River group, Beloit, Wisconsin. 

 Collection. Geological and Natural History Survey of Minnesota. 

 Museum Register, No. 7322. 



