510 University of Kansas Geological Survey. 



spreading branches, each of which has sometimes three and 

 sometimes two nearly equal, digitate branchlets at the end, 

 and two or three similar ones on the other side ; first lateral 

 sinus about as wide as long, but narrower than the siphonal 

 lobe and divided at the free end into two short, nearly equal 

 free branches, each of which is again less deeply subdivided 

 into about two or three or four sinuous, spreading and digitate 

 branchlets ; first lateral lobe oblong ovate, being longer and 

 narrower than the siphonal lobe, and deeply divided at its end 

 into two very nearly equal branches, with each from four to 

 five spreading and digitate subdivisions, in part so arranged as 

 to give the main branches a tripartite appearance at their ex- 

 tremities ; second lateral sinus of nearly the same size as the 

 first, and, excepting in unimportant details, similarly branched 

 and subdivided ; second lateral lobe broader and shorter than 

 the first, and bearing two large, equal, tripartite, sinuous and 

 digitate terminal branches, and small digitate and simple lat- 

 eral branches ; third lateral sinus much smaller than either of 

 the others, with two unequal, short, dentate terminal divisions, 

 and a few irregular, short, smaller spurs ; dorsal or, anti- 

 siphonal lobe (ventral lobe of d'Orbigny and others) scarcely as 

 large as three or four small lateral branches, and normally a 

 trifid free extremity." 



No complete specimens of Bacutites ovatus have been collected 

 from the Kansas Fort Pierre area. In the summer of 1896 I 

 collected several large fragments of the shell from Devil's 

 Canon of the South Fork of the Republican, in Cheyenne 

 county. The longest of these fragments measured fifteen inches 

 in length. It is the most common form in the Arickaree 

 shales, where it occurs free. Other specimens of this species 

 now in the University collection were obtained by Williston 

 from the Fort Pierre formation on the North Fork of the Smoky 

 Hill river, near McAllaster. The interior of many of these 

 specimens is filled with beautiful crystals of barite. These 

 latter specimens were from the large mass discovered many 

 years previously by Prof. B. F. Mudge, and to which the letter 

 from Meek refers, as quoted on page 20 of this volume. 



