PLATE LXIV. 



Page 

 Physetocrinus ventkicosus (Hall) 593 



. 1. Specimen with arms, stem, and root. 



2. Lateral view of the calyx. 



3. Anterior view of the calyx. 



4. Posterior view of a small elongate specimen. 



5. Dorsal aspect of a depressed specimen of Hall's variety " Actinocrinus " reti- 



culatus. 



6. Anterior view of the calyx. 



7. Anterior view of a specimen of the type of McChesney's "Actinocrinus" 



subventricosus. 

 8a. Specimen from the Lower Burlington limestone. 

 8b. Ventral aspect of the same specimen. 



Physetocrinus dilatatus M. and W 595 



9. The type specimen. (After Meek and Worthen.) 



10. Dorsal aspect of another specimen. 



(All specimens, except Fig. 9, in the collection of Wachsmuth and Springer.) 



