FROM THE CRETACEOUS FORMATION OF NEBRASKA. 391 



are crossed by rounded, elevated revolving bands, separated by spaces less than twice 

 their width. Aperture unknown ; canal ? Spiral angle about 4 50' ; length of 

 imperfect shell, .6 inch. Last volution more than half the whole length; breadth, .35 

 inch. 



This shell has the general aspect of Buccinum, though its superficial characters 

 leave some doubts, which, from the imperfection of the base of the shell, cannot be 

 entirely removed by the most careful examination of our specimen. The surface has 

 been marked by several strong varices, which in this specimen are all exfoliated, leav- 

 ing a groove, with several pits or indentations formed by the denticulations of the lip. 

 The elevated revolving bands constitute a distinguishing feature of the shell, having a 

 uniform character, and appearing like strips of enamel laid over the surface. 



Locality and Position. Great Bend. Lower part of division No. 4 of Section. 



Fusus SHUMARDII, n. sp. 

 PLATE III. FIG. 6, a, J, c. 



Shell elongate fusiform ; spire elevated ; volutions six or more, moderately convex ; 

 suture defined, not deeply impressed ; surface marked by strong longitudinal obtuse 

 folds, which are equal to the spaces between them, and by finer lines of growth, 

 crossed by strong elevated revolving bands wider than the spaces between them, with 

 sometimes an intermediate smaller one. Aperture slightly oblique, narrow, obtusely 

 angular behind, and gradually narrowing in front into the prolonged canal; canal 

 slightly bent and twisted. Spiral angle about 35. Length, .66 inch ; width, .25 inch. 

 The last volution .55 of the whole length. 



The almost equal proportions between the spire and length of aperture, and the 

 elongated form of the shell, are conspicuous features. The longitudinal folds are 

 slightly curved on the volutions of the spire ; the revolving bands are flat, and under 

 a magnifier show well defined, angular edges. 



Locality and Position. Great Bend of the Missouri. Lower part of division No. 

 4 of Section. 



\ 

 Fusus CONSTRICTUS, n. sp. 



PLATE III. FIG. 7, a - d. 



Shell fusiform ; spire moderately elevated (imperfect above in our specimen) ; volu- 

 tions five or six, convex; suture distinct; surface marked by strong longitudinal 



