PLATE LXX. 



Page 

 Plattcrinus sar.e Hall 677 



Fig. 1. Specimen with faintly ornamented plates. 



Plattcrinus nodo-striatus W. and Sp 698 



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



4fi. Lateral view of the calyx; an older specimen. 



ib. Anal side of the same specimen. 



4c. Ventral aspect of same. 



Platycrixus brevinodus Hall 688 



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



root, and four arms to the ray. 

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

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



Platyckinus tenuibrachiatus Meek and Worth 687 



7. A specimen with arms. 



8. Another specimen, slightly differing in ornamentation. 



Platycrixus subspinulosus Hall 684 



9. A highly ornamented calyx. 



Platycrtnus Sampsoni S. a. IMiller 673 



10. Lateral view of the calyx. 



Plattcrinus Pratteni Worthen 671 



11. A specimen with arms. 



12. The basal disk. 



Platycrtnus pilkiformis Hall 656 



13a. Lateral view of the calyx. 

 135. Posterior side of the calyx. 



Platycrinus Davisi W. and Sp 684 



14. Lateral view of the type specimen. 



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



