WANTON.] STEPHANOCERATID.fi 185 



differences between these two forma are in their septa, the siphonal 

 lobe of the form under consideration being proportionally much nar« 

 rower, and provided with three, instead of only two, branches on each 

 side, while iis first Lateral lobe is tripartite (an unusual feature in the 

 genus) instead of bind. It is also related to 8» Texanu% Roeiner, 1 

 though its septa differ as widely from those of that species as from 

 those of > s '. hippocrepis. 



"Locality andposition, — Chippewa point, near Port Benton, on the 

 upper Missouri ; "from the Port Benton group of the upper Missouri 

 Cretaceous series. Specimen discovered by Lieut. John Mullan, of the 

 [Jnited States Topographical Engineers." 



Soaphitbs warreni Mvri and Hayden. 

 PI, \uv, Pigs. 1-7. 



SeapMUi warreni Meek and Hayden, 1860, Proo, Acad. Nat. 8ci. Phila., i>. 177; White, 

 L870, U. 8. Geog. and Geol. Sur. West LOOth Meridian, vol. tv, p. 200, PI. L9, Pig. 

 8a; Meek, L8T6, U. S. Geol. Sur. Terr., vol.ix, p.420, P1.6,Fig.5j Whitfield, 1880, 

 Geol. Blaoi Hills of Dak., p. ill, PI. 13, Figs. 1 4. 



Soaphitea warreni, var. wyomlngensis Meek, L876, ibid., p. 421, Fig. 61 63 in text. 



Soaphitea wyomingensis Whitfield, i880, ii>i<i.. p. 446, PI. L8, Figs.5 7. 



Compare Soaphitea aqualis Sowerby. 



Meek's description of fche type is as follows: 



"Shell small, transversely subovate, moderately compressed ; inner 

 volutions uearly circular, closely involute, and composing a compara- 

 tively rather Large pari of I he entire bulk • deflected body portion short 

 and (perhaps accidentally) rather more compressed proportionally than 

 the inner turns ; surface costate, and without proper nodes; costs small 

 <>n the inner volutions, where they <lo uot differ materially in size, but 

 on the body part about every fourth or fifth one becomes more promi- 

 nent than the others, and extends entirely across from the inner side 

 to and over the periphery, in passing upon which they bifurcate, or 

 give off lateral branches, so that the whole, with some Intercalated 

 ones, assume there a uniform size; aperture and septa unknown. 



" Length, L.45 inches; height, about l.'Ji! inches; convexity, about 

 o.fn inch." 



The type is an imperfect specimen I hat does not show the entire form 

 nor the sepia. Af!erw;ird other examples were found that showed 

 these details and that differed slightly from the type in form and sur 

 face ornamentation, so that they could noi be positively identified with 

 It, and Mr. Meet therefore called them Scaphites warreni, var. Wyoming- 



nisis. 



Mr. WhiMield regarded this variety as ;i distinct species, assigning 

 to it the smaller specimens with more compressed volutions, in dis 

 cussing its relations with & warreni he says: "The principal differ 



1 k n ni. \un Texa i, tab. I, i''ij;. 4. 



