INVERTEBRATES. 261 



and below, and the last one is more angular around the middle ; while its aper- 

 ture is more depressed and angular than in Phillips's species. It likewise dif- 

 fers from that shell in being destitute of a raised line around the upper margin 

 of the whorls, and in having a small, open umbilicus. The specimen we have 

 figured is not in a very good condition to show the surface markings. The spe- 

 cific name was given in honor of Dr. B. F. Shumard, of St. Louis, Mo. 



Locality and 'position : Warsaw, Illinois; Keokuk group, of Subcarboniferous 

 series. 



