CEPHALOPODS. 225 



Metaceras sangamonense (MEEK & WORTHEX). 



Nautilus (Discus ) sangamonensis Meek & Worthen, 1860 : Proc. Acad. Nat. 



Sci., Phila., p. 470. 

 Nautilus sangamonensis Meek & Worthen, 1866 : Geol. Sur. Illinois, vol. II, 



p. 386, pi. xxix, figs. 3-3b. 



Metaceras sangamonense Hyatt, 1884: Proc. Boston Soc. Nat. Hist., vol. 

 XXII, p. 208. 



Shell like that of JV. occidentalis but less robust, the nodes 

 also being less prominent, and the peripheral rows absent. 



Horizon and localities -U "pper Carboniferous, Upper Coal 

 Measures : Kansas City. 



Lituites? complanatus SHUMABD. 



Lituites complanata Shumard, 1863: Trans. St. Louis Acad. Sci., vol. 

 II, p. 107. 



Shell small, depressed, discoidal ; sides very gently con- 

 vex; volutions about four, not embracing, sloping from the 

 ventral to the dorsal, which latter is subangulated ; transverse 

 section ovate ; siphuncle small, dorsal ; septa thin, concave, 

 those of the last volution near the outer chamber scarcely 

 more than one-half the width of those of the inner volutions. 

 No surface markings are visible on any of the specimens under 

 examination. (Shumard.) 



Horizon and localities Cambrian ? magnesian limestone 

 series : Ozark county. 



Orthoceras chouteauense SWALLOW. 



Orthoceras chouteauense Swallow, 1860 : Trans. St. Louis Acad. Sci., vol. 

 I, p. 660. 



A small form, tapering moderately ; septse distant. 



Horizon and localities Lower Carboniferous, Chouteau 

 (Kinderhook) limestone: Cooper county, Louisiana (Pike 

 county ). 



Orthoceras chesterense SWALLOW. 



Orthoceras chesterense Swallow, 1863: Trans. St. Louis Acad. Sci., vol. II, 

 p. 98. 



A rapidly tapering form, with moderately distant septse. 

 Horizon and localities. Lower Carboniferous, Kaskaskia 

 limestone : Ste. Mary (Ste. Genevieve county). 

 G 16 



