(ilATIIKKEKAS. 65 



convex to the slope into the unil)iliciis. wliich is more slmiply eiirvod. Aperture 

 veiy narrow aiul nmch I'lonyated. Sej)ta on the sides of the volutions strongly sig- 

 nididal. witli tiie curves or lobes which stand back toward the apex much more 

 sharply turned than thost^ pointing' in tii(> opposite direction. Outer shell entirely 

 wantiny- in the specimt>n. 



McChesnev's drawing' and description do not permit a certain deter- 

 mination as to wlietlier tliis species is a Ghjphioccras or a (iastrioceras. 

 OccKrrciicr. — ^fiddle Coal Measnres, Lasalle, 111. 



Glyphiocera8 ? LEVicuLUM Miller and Faber. 



I'l. VIII, figs. 10, 11. 



1892. Goniatiteii leviculun. Miller and Faber. Jour, (.'incinnati Soc. Nat. Hist., Vol. 

 XIV. p. KIT. PI. VI. tios. 10. 11. 



Shell discoidal, whorl highly arched with gently ronnded sides and 

 highly arched narrow abdomen. Und^ilical .shouldei's abru])t. Whorls 

 deeply embracing, the onter whorl being indented to about one-third of its 

 heiffht by the next inner volution. Width of whorl is nu)re than three- 

 fourths of its height. Umbilicus wide and deep, width is one-third of the 

 total diameter. On the inner whorls the umbilicus is proportionally nar- 

 rower, and the breadth of the whorl greater than its heiglit. 



Surface of shell smooth, no constrictions or ribs having been seen. 

 Specimens septate throughout, thus the body chamber and aperture are 

 unknown. 



Septa close together and sinuous, as is usual in the Glyphioceratidje. 

 The ventral lobe is divided by a small pointed siphonal saddle; the lateral 

 lobe is funnel-shaped and pointed; the external and the lateral saddles are 

 broadly rounded. There are three internal lobes as in all typical Glyphio- 

 ceratida?, but their shape could not be ascertained. 



Occurrence. — Lower Carboniferous, St. Louis stage, Crab (Orchard, Ky. 

 The type is deposited in the paleontologic collection. Walker Museum, 

 University of Chicago. 



Glyphioceras PYGMiEUM Wiucliell. 



1862. Goniatites pyf/iuxux.^ A. Winchell, Am. Jour. Sci., 2d series, Vol. XXXIII, 

 p. 366. 

 Shell globose, involute, umbilicus small. Whorl broad, depressed, 

 breadth ecpial to one-half of the total diameter. Surface with four constric- 

 tions to a revolution. 



MON XLII — 02 



