GASTEROPODS. 211 



Soleniscus missouriensis (SWALLOW). 



Macrochilus missouriensis Swallow, 1858 : Trans. St. Louis Acad. Sci., 



vol. I, p. 201. 

 Macrochilina missouriensis Miller, 1890: N. A. Geol. and Pal., p. 409. 



Shell large, somewhat ventricose ; spire elevated. Whorls 

 seven or more in number, the last large, all quite convex ; 

 suture deep. Aperture long, ovate, lanceolate ; columellar fold 

 rather prominent. Surface smooth. 



Horizon and localities. Upper Carboniferous, Upper 

 Coal Measures : Kansas City. 



Soleniscus paludinaeformis ( HALL). 



Macrochilus paludinceformis Hall, 1858: Geology Iowa, vol. I, pt. ii, p. 



719, pi. xxix, fig. 10. 

 Soleniscus (Macrochilus) paludinceformis White, 1884 : Geol. Sur. Indiana, 



13th Ann. Rep., p. 154, pi. xxxiv, fig. 17. 

 Soleniscus paludinceformis Keyes, 1889: Proc. Acad. Nat. Sci., Phila., p. 



308. 

 Soleniscus paludinceformis Keyes, 1891: Proc. Acad. Nat. Sci., Phila., p. 262. 



Shell thin, rather broadly subfusiform, the spire forming 

 about one-half the length ; volutions six to ten in number, 

 slightly convex, the body-whorl rather more ventricose than 

 those of the spire ; suture line moderately impressed ; columel- 

 lar fold and grooves well defined. Surface marked only by 

 fine lines of growth. 



Horizon and localities. Upper Carboniferous, Upper 

 Coal Measures : Kansas City. 



Soleniscus gracilis (Cox). 



Macrochilus gracile Cox, 1857 : Geol. Sur. Kentucky, vol. Ill, p. 570, pi. 



viii,figs. 11-lla. 



Macrochilus gracile Keyes, 1888 : Proc. Acad. Nat. Sci., Phila., p. 239. 

 Soleniscus gracilis Keyes, 1889 : American Naturalist, vol. XXIII, p. 423. 

 Soleniscus gracilis Keyes, 1889: Proc. Acad. Nat. Sci., Phila., p. 307. 

 Macrochilina gracilis Miller, 1890 : N. A. Geol. and Pal., p. 409. 

 Soleniscus gracilis Keyes, 1891 : Proc. Acad. Nat. Sci., Phila., p. 262. 



Shell small, like S. brevis, but more slender and with the 

 spire much higher. 



Horizon and localities. Upper Carboniferous, Lower Coal 

 Measures : Clinton ( Henry county ). 



