Structure of the Stemmed Echinoderms. Plate XXI. 



Fig. 1. Batocrinus 'pyriformis . 



Outline of a nearly perfect specimen. 



Fig. 2. A typical Actinocrinoid 



Showing arrangement of basal plates. 



Fig. 3. Scaphiocrinus rufticellus. 



Outline of a nearly perfect specimen. 



Fig. 4. Platycrinus symmetricus. 



Ventral View. (Keyes collection.) 



Fig. 5. Platycrinoid . 

 Basal plates. 



Fig. 6. Lyriocrinus mellissa. 



Ventral view. (Keyes collection. ) 



Fig. 7. Cyathocrinoid. 

 Basal plates. 



Fig. 8. Forbesiocrinus ag assist . 



A nearly perfect individual. 



Fig. 9. Symbathocri)ius wortheni. 

 A perfect crown . 



Fig. 10. Dichocrinoid . 



Diagram of basal cup. 



Fig . 11 . Orophocrinus fusiformis . 



Shows pinnules. (Keyes collection.) 



Fig. 12. Pentremites elongatus. 

 Lateral view. 



Fig. 13 Blastoid. 



Showing arrangement of basal plates. 



