410 /^roccctliiii/s (if l/w O/iio State .Icdiiciiix of Science. 



revolving stri;L\ lia\-iiig a sijacc Ijetwccii them on the ])eri|)liery 

 and a single finer line below, anrl c)ne above near the suture; 

 the last volution not ventricose. and marked b\' a fifth revolving 

 striation. which is a continuation of the suture line; aperture 



a b 



Fig. 32. — Murchisonia vermicula. 



a. — An outline drawing of an individual which has undergone much 



erosion, enlarged four diameters. 



b. — Two whorls of another specimen, enlarged to eight diameters 



in order to show the characteristic markings. 



broadly oval, rounded below; cohuuella imperforate. Shell 



minute. 



"Length. . 14 of an inch [Hall, i8<S3]." 

 Horizon and locality. — !\[axville limestone. 



Lower zone: Cut Xo. 4. Alt. I'erry-b^iltonham. 



CLASS CEPHALOPODA. 



ENDOLOBUS SPECTABILIS— Me.k and Worthen. 



18G0. Nautitus sfcctahilis. Meek and Worthen, Proc. Acad. Xat. Sci. 

 Phil., p. 409. 

 Chester limestone: Gravel Creek, Illinois. 

 1865. N^autilus (Eudotobiis) perariif'lus. Meek and Worthen, Proc. Acad. 

 Xat. Sci. Phil, p. 2.j!l. 

 Chester group: Randolph County, Illinois. 

 L'^lid Nautilus (Eiidolobus) sf>ectabilis. Meek and Worthen, Geol. Surv. 

 111., Vol, IT, p, .S118, pi. -i.-), figs. La, h. 

 Chester group: Randolph County, Illinois. 

 L*^!)L A'Ciutilus (Teinnocheilus) sfccfabilis. Whitfield, Ann. X. Y. Acad. 

 Sci., Vol. V, p. 594, pi. 14, fig. 22. 

 Maxville limestone : Near Rushville, Ohio. 

 1894. Nautilus spectabilis. Keyes, Mo- Geol. Surv., Vol. Y, p, 222, 

 Kaskaskia limestone : St. Louis County, Missouri. 



