362 UNITED STATES GEOLOGICAL SURVEY OF THE TERRITORIES. 



originally drawn ; but the foregoing cut has been made for that purpose. 

 The plait can never be seen in specimens with the aperture partly full of 

 rock, as shown in our figure 1, e. 



Specimens of this species with the vertical tidds most distinctly devel- 

 oped more nearly resemble the Tertiary Fusus Note, Lamarck, than any 

 other form that I can at present recall to mind among foreign figured shells; 

 but that form is not so nearly related as to require close comparisons, espe- 

 cially as it came from such a widely distinct horizon. 



The more elongated spire, more convex volutions, and vertical folds will 

 at once distinguish this from the last. 



Locality and position. — Moreau River; from the Fox Hills group of the 

 Upper Missouri Creiaceous series. It is one of the most abundant of our 

 Upper Missouri Cretaceous gasteropods. 



Fasciolaria (Plestochilus)i Galpiniana, M. & H. (sp.) 



Plate 32, figs. 2. a,b. 



Futus Galjnnianns, Meek autl Hayden (1856), Proceed. Acad. Nat. Sci. PMlad., VIII, 05. — Meek (1864), 



Suiithsouiau Check-List N. Am. C'ret. Fossils, 22. 



Shell unequally fusiform ; spire rather elevated, or apparently slightly 

 exceeding the length of the aperture and canal; suture distinct ; volutions 

 about six, slightly convex, upper ones with apparently obscure traces of 

 vertical folds; last, or body volution contracting rather abruptly into the 

 comparatively short, somewhat bent, canal; aperture a little obliquely 

 lance-oval, being acutely angular above, and tapering into the narrow canal 

 below; columella a little twisted and bent below, not showing any plaits 

 externally ; surface marked by regular, revolving, somewhat flattened, lines, 

 a little wider than the linear furrows between them, and more or less strong 

 lines of growth, that show by their curves that the outer lip is broadly sinu- 

 ous above. 



Length, about 0.88 inch; breadth, U.o4 inch; apical angle of spire, 32°. 



This shell is very similar to the last, but differs in having its canal rather 

 decidedly shorter, more bent, and more tortuous ; while the revolving lines 

 on its body-volution are proportionally a little wider. I have had no means 

 of deciding the question whether or not it has the columellar plaits of this 

 group, having only seen two specimens, and these not being in a condition 

 to show the columella, excepting at the aperture. From its close similarity 

 to the last -described species in all known specific characters, 1 can scarcely 



