Plate 10. 



Page. 

 DOLATOCRINUS SPINOSUS MiUer and Gurley 17.34 



Fig. 1. A very large variant of this species, figured to show the peculiar con- 

 struction of the cohunn, with nodals separated, and internodals of 

 less diameter appearing between them. 



DOLATOCRINUS GRANDIS Miller and Gurley 17,32 



2. Part of stem attached to a large calyx, with nodals in close contact, 

 and cog-like processes forming continuous ridges. 



DOLATOCRINUS, various species 17,18 



3-7. Stem fragments showing different stages of the nodal columnals, 

 for comparison with the stems shown in the last two figures. 

 Louisville area: Probably Hamilton. 



DOLATOCRINUS EXSTANS, new species 37 



8. Basal view of flattened specimen, showing the protu])erant base. 



9. Tegmen of another specimen showing the long spines: it is flattened 



and has on the opposite side the same kind of base as shown in figure 8. 

 Figs. 1, 2, 8, 9, from the Onondaga: Louisville area. 



DOLATOCRINUS LIRATUS Hall 41 



10. 11. Tegmenal and basal views of two characteristic specimens from 



the Hamilton of western New York. 



69 



