INVERTEBRATES. 525 



Position and locality : Qnite rare in^tbe Keokuk limestone, at Keo- 

 knk, Iowa, and Warsaw, Illinois. A single example of apparently the 

 same species, lias been found in the Warsaw division of the St. Louis 

 Group, at Warsaw, Illinois. 



COAL MEASURE SPECIES. 



Genus AXOPHYLLUM, Edwards and Haime. 



Axophtlltjm ETJDis, White and St. John. 



PI. 32, Fig. 6, a, b, c. 



" Coral irregularly turbinate, contorted, often attached along a great 

 portion of its length, usually expanding rapidly; surface marked by 

 irregular concentric undulations of growth, and often also by numerous 

 rootlets, some of which clasp the objects to which they may be attached. 

 Outer portion of the calyx shallow, central portion rather deep, colu- 

 mella small, flattened, the greater diameter being from the concave to 

 the convex side." 



The above is the original description of this species by the authors 

 cited above, as published in the Trans, of the Chicago Acad, of Sciences, 

 Vol. I, p. 117, and agrees very well with the Illinois specimens illustra- 

 ted on PI. 32, fig. 6. 



Position and locality : . Near Collinsville, St. Clair county, Illinois, 

 from a calcareous shale 117 feet above the Belleville coal. 



AXOPHYLLTJM INFTJNDIBULUM, Worthen. 



PI. 32, Kg. 7. 



Coral turbinate, sometimes showing indications of attachment at the 

 lower extremity ; epitheca thin, and showing on its surface numerous 

 undulations of growth, the young individuals originating at the bottom 

 of the calyx, and the old examples presenting the appearance of a series 

 of deep cups placed one within the other. Septa about 40. Colu- 

 mella nearly obsolete in some examples, and much less strongly defined 

 than in A. rudis. 



Position and locality : Clark county, Illinois, about the horizon of 

 coal No. 12. 



