EXPLANATION OF PLATE VI. 



(Figures 2-7, 18-19 contributed by Dr. W. B. Clark; figures 8-17 after Clark.) 



RHIZOCRINUS CYUNDRICUS n. sp p. 275 



i. Lateral view of a complete body, (x2). 



2-7. Views from various sides of several column joints, probably 

 belonging to this species, (enlarged). 



Vincentown limesand; Vincentown, (154). 



PENTACRINUS BRYANT Gabb, p. 276 



8. End view of a detached column joint. 



9. Lateral view of a portion of the column. 



Vincentown limesand; Vincentown. 



GONIASTER MAMMILATA Gabb, p. 277 



10-16. Views from various sides of four different plates, (x2). 

 17. Surface of plate greatly magnified. 



Vincentown limesand; Vincentown. 



PENTACEROS ASPERULUS Clark n. sp., p. 278 



18-19. Upper and side views of a plate, (enlarged). 

 Vincentown limesand; Vincentown. 



892 



