Carboniferous Rocks of the Mississippi Valley. 293 



radial plates, is intermediate between the two. In the 

 form of the large anal plate, and the small intercalated 

 quadrangular plate, it resembles the C. spurius, from which 

 it differs in form of body plates, etc. 



Geological formation and locality. Burlington limestone, 

 Burlington, Iowa. Collection of C. A. White. 



Cyathocrinus solidus (n. s.). Body calyculate, moder- 

 ately expanded from the top of the column to the free 

 arms, somewhat broadly truncated at base by the summit 

 of a large column. Basal plates small, tumid, width above 

 the top of the column greater than the height, somewhat 

 pointed above. Sub-radial plates rather large, thick, and 

 a little gibbous, height and width nearly equal. First ra- 

 dial plates large, three of them twice as high as wide, the 

 other two smaller and somewhat different in form. Sec- 

 ond radial plates very short, quadrangular or linear, with 

 the lateral margin attenuated. Third radial plates short, 

 triangular or pentagonal. First anal plate large, quadran- 

 gular. 



The plates have a thick, robust aspect, and the entire 

 body is strong. Surface striato-granulate. 



This species has the general form of C. sculptilis, (Sup- 

 plement to Geol. Rep. of Iowa,) but the plates have not 

 the strong elevations or folds, and the rhombic depressions 

 at the junction of the plates do not constitute a feature of 

 the body. 



Geological formation and locality. Burlington lime- 

 stone, Burlington, Iowa. Collection of Rev. W. H. Bar- 

 ris. 



Cyathocrinus Hoveyi (n. s.). Body robust, broadly ca- 

 lyculate or cyathiform, width once and a half as great as 

 the height. Basal plates large, distinctly angular at the 

 outer extremity, and about one third their length covered 

 by the column. Sub-radials very large, length and width 

 nearly equal, three hexagonal, the others apparently hep- 



