474 University of Kansas Geological Survey. 



Second lateral lobe very small and obscurely trifid at the end 

 forming the ventral lobe. Second lateral sinus but little if any 

 larger than the first, and merely obscurely divided into very 

 short, simple, obtusely rounded terminal subdivisions." 



Specimens of this species are abundant in the Septaria hori- 

 zon of the Fort Benton formation. They have been collected 

 from the Blue Hills shales on the Smoky Hill river, and from 

 similar outcrops on the Saline river. 



Scaphites verwiiformis M. & H. Plate civ, fig. 3. 



ScaphUex vermiformis M. & H., 1862, Proc. Acad. Nat. Sci., Phil., p. 22; 

 Meek. 1876, U. S. Geol. Surv. Terr., vol. ix, p. 423, pi. vi, ff. 4a, b ; Stanton, 

 1893, Bull. U. S. Geol. Surv. No. 106, p. 183, pi. xliv, f. 3. 



Revised description: "Shell somewhat less than medium 

 size, ovate subdiscoidal in form ; umbilicus moderately small 

 in comparison with the size of the shell ; inner volutions closely 

 involute, regularly coiled, 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 costie, which are 

 rather small and nearly regular on the inner volutions, but 

 become more distant and larger as well as 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 the opposite sides generally alternate ; costse all pass- 

 ing nearly straight across the periphery, on which they are 

 nearly uniform in size, with the exception of their regular en- 

 largement with the whorls. The nodes mentioned above are 

 directed out at right angles to the sides of the shell, and, like 

 the costse, become again smaller toward the aperture. Most 

 of the large costse bifurcate at the nodes of the body part of the 

 shell, but their number is also increased by the intercalation of 

 others between. Where they thus branch at the nodes on one 

 side, the two divisions crossing over the periphery from the 

 point of bifurcation never both connect at a node on the oppo- 



