INVERTEBRATE PALEONTOLOGY. 423 



to S. cequalis. Should a thorough comparison of a good series of specimens 

 from the original locality from which the type of S. Warreni was obtained, 

 show it to be specifically distinct from the Wyoming shell, the latter might 

 take the name S. Wyomingensis. Even if, on the other hand, it should 

 be thought too closely related to S. cequalis to be separated specifically, it 

 would still be distinct enough to stand as a marked variety, under the name 

 Wyomingensis. 



This and the preceding species belong to the division (a) of the typical 

 subgenus Scaphites. 



Locality and position. — The type-specimen was obtained at the southern 

 base of the Black Hills ; in the Fort Benton group of the Upper Missouri 

 Cretaceous series. Dr. Newberry also found this shell at several localities in 

 New Mexico ; and Dr. Schiel figures, on plate 3 of his Report on the Geology 

 of the Thirty-eighth and Forty-first Parallels of North Latitude (Pacific Rail- 

 road Report, II), a fragment apparently of this fossil. The specimens from 

 Wyoming, illustrated by our cuts, came from Medicine Bow River; and it 

 occurs in the same Territory east of Fort Steele. I have never seen this 

 fossil from any locality east of the Mississippi. 



Scaphites vermiformis, M. &H 



Plate 6, figs. 4, a, h. 



Scaphites vermiformis, Meek and Haydeu (1862), Proceed. Acad. Nat. Sci. Pbilad., XIV, 22.— Meek (1864), 

 Smithsonian Cbeek-List N. Am. Cret. Fossils, 24. 



Shell under medium size, ovate-subdiscoidal in form ; umbilicus very 

 small ; inner regularly-coiled volutions closely involute, deeply embracing, and 

 composing a rather large portion of the entire shell ; deflected part very 

 short, so as only to be slightly disconnected from the inner turns at the 

 aperture, which is a little contracted and quadrato-subcircular in outline, 

 with a slightly sinuous inner margin; surface ornamented by numerous 

 straight costse, which are rather small and nearly regular on the inner volu- 

 tions, but become more distant and larger, as well as much more prominent, 

 on the inner half of each side of the body-portion, where they each support a 

 prominent node at the outer end, so arranged that those on opposite sides 

 generally alternate ; costse all passing nearly straight across the periphery, 

 on which they are of nearly uniform size, with the exception of their regular 

 enlargement with the whorls. 



