554 GEOLOGICAL SURVEY OF IOWA. 



The small calyx does not show any very strong distinctive characters : the base 

 is somewhat abruptly rounded on the edges, and the sides are regularly eloping 

 nearly direct to the radial plates, which are a little more spreading. 



Fig. 6 a. Anal side of calyx. 



Fig. 6 b. The anterior side. 



Fig. 6 c. Basal view of another specimen, where the basal plates are wanting. 



Geological formation and locality. In the Burlington limestone : Burling- 

 ton, Iowa. 



Cyathocrinns malvaceus ( n. s.). 



PLATE IX. FIG. 4 a, b. 



BODY small, depressed subglobose, concave in the centre 

 below, spreading and gibbous at the base and contracted 

 towards the upper margin. Basal plates minute, pentagonal. 

 Subradial plates pentagonal, the length equal to the greatest 

 width, projecting horizontally beyond the basal plates below, 

 very gibbous in the middle, and bending abruptly upwards 

 from the lateral angles. Radial plates small, somewhat hep- 

 tagonal, width greater than the height, emarginate above ; 

 the articulating scar reaching one-third the entire length of 

 the plate. Anal plate small, quadrangular. Arms unknown. 



SURFACE marked by somewhat granulose striae, which ra- 

 diate towards the margins of the plates. Column small. 



In this specimen the surface is much worn, and appears to be nearly smooth, a 

 single plate showing the radiating striae. 



Fig. 4 a. The anal side of the specimen. 



Fig. 4 b. View of the base, showing the depressed centre and minute basal plates. 



Geological formation and locality. In the Burlington limestone : Bur- 

 lington, Iowa. 



^ 



Cyathocrinus divaricatus (n.s.). 



PLATE IX. FIG. 5. 



BODY small, depressed subglobose, broader than high, 

 greatest diameter through the centre of the subradial plates. 

 Basal plates moderately large, not depressed in the centre, 

 scarcely rising above the plane of the base of the succeed- 



