EXPLANATION OF PLATE 3. 



Fig. 1. Pentremites florealis Say, side view. X H 15 



2, 3, 4. Troostocrinus reinwardtii (Troost), side, top, and basal views of 



Troost's type of Pentremites reinwardtii. X 1J 17 



5. Pentremites godoni Defrance, side view of specimens described by 



Troost as Pentremites globosus. X3 13 



6. Nucleocrinus globosus (Troost), side view of Troost's type of Olivanites 



globosus 19 



7. Nucleocrinus verneuili (Troost), side view of a worn specimen, drawn in 



an inverted position 18 



8. 9. Basal and top views of the same specimen. 



10. Posterior view of a more perfect specimen. 



11, 12, 13. Top, basal, and side views of the same specimen. The speci- 



mens figured were described by Troost as Olivanites verneuili. 

 14, 15, 16. Pentremites sulcatus Roemer, side, top, and basal views of a 



large specimen. This is from Troost's type of PentremAtes cherokeus. 1G 

 122 



