stanton] STEPHANOCERATIDiE. 183 



rather long, slender, and straight to the recnrvatnre, thence continued 

 backward until it conies nearly in contact with coiled inner volutions; 

 aperture apparently circular; surface ornamented by small costre, 

 which pass from the inner side of the volutions to about halfw r ay 

 across their lateral surfaces, where they swell into small, obscure, 

 transversely elongated nodes, and then branch each into two or three 

 smaller linear ribs, all of which pass straight over the periphery. 



" Length, 0.87 inch; height, 0.03 inch; convexity, 0.33 inch. 



"The septa of this species are comparatively rather simple, being 

 each provided with but two principal lateral lobes on each side, none 

 of which are deeply divided. The siphonal lobe is longer than wide, 

 and has two very small, short, nearly parallel, obscurely bifid terminal 

 divisions, with a more oblique, somewhat similar branch on each of the 

 sides above. The first lateral sinus is wider than the siphonal lobe, 

 and nearly as long, with its extremity deeply divided by a slender, 

 obscurely trifid, auxiliary lobe, into two very unequal, more or less 

 sinuous, and obtusely digitate branches. First lateral lobe about half 

 as wide as the siphonal, but somewhat shorter, and bearing two very 

 small terminal divisions similar to those of the siphonal lobe. Second 

 lateral sinus not larger than the outer division of the first, and merely 

 obscurely divided into very short, simple, obtusely rounded terminal 

 subdivisions. Second lateral lobe very small and obscurely trifid at 

 the end. Whether this last is what is usually called a ventral lobe, or 

 whether there is another still smaller one beyond it, the specimen is 

 scarcely in a condition to show. 



"At one time I was inclined to think a very small species described 

 by Dr. Shumard from the Cretaceous rocks of Texas, under the name 

 Scaphites vermiculus, might be identical with this; but a sketch of that 

 species sent to me some years back by Dr. Shumard shows it to be 

 entirely distinct, being even a more slender, differently marked shell, 

 with a proportionally much larger umbilicus and a longer deflected 

 body-portion; that is to say, it presents the characters of the distinct 

 section Macroscaphites. 



"This species is perhaps more nearly allied to S. Hugardianus 

 d'Orbigny, 1 than to any other foreign form, but yet differs too much to 

 require a critical comparison or detailed statement of differences. 



" Locality and position. — Eastern base of the Black hills; from the 

 Fort Benton group of the upper Missouri Cretaceous series.' 7 



Scafhites vermiformis Meek and Hay den. 

 PI. xliv, Fig. 3. 



Scaphitcs vermiformis Meek and Hayden, 1862, Proc. Acad. Nat. Sci. Pliila., p. 22; 

 Meek, 1876, U. S. Geol. Sur. Terr., vol. ix, p. 423, PI. 0, Figs. ia, b. 



Revised description : 



"Shell under medium size, ovate subdiscoidal in form; umbilicus 

 very small; inner regularly coiled volutions closely involute, deeply 



'Pal. Fr., 1, Terr. Cret., 525. 



