PLATE LXX. 



Page 



Platyceinus sAEiB Hall 677 



Fig. 1. Specimen with faintly ornamented plates. 



Platyceinus nodo-stbiatus W. and Sp 698 



3. Specimen with six to the ray, the most frequent number. 



4a, Lateral view of the calyx; an older specimen. 



45. Anal side of the same specimen. 



4c. Ventral aspect of same. 



Platyceiuus beevinodus Hall 688 



2. Specimen from the upper part of the Burlington limestone ; with column, 



root, and four arms to the ray. 

 5. Specimen from same horizon with six arms to the ray. 

 6a and b. Two specimens from the Keokuk group of Indian Creek, Ind. 



Platyceinus tenuibeachiatus Meek and Worth 687 



7. A specimen with arms. 



8. Another specimen, slightly differing in ornamentation. 



Platyceinus subspinulosus Hall 684 



9. A highly ornamented calyx. 



Platyceqtds Sampsoni S. A. Miller 673 



10. Lateral view of the calyx. 



Platyceinus Peattent Worthen 671 



11. A specimen with arms. 

 ' 12. The basal disk. 



Platyceinus pileieoemis Hall 656 



13a. Lateral view of the calyx. 

 135. Posterior side of the calyx. 



Platyceinus Davisi W. and Sp 684 



14. Lateral view of the type specimen. 



(All the specimens in the collection of Wachsmuth and Springer.) 



