306 The Crinoidea of the Lower Niagara Limestone. 



The peculiar surface marking, the convex plates with the con- 

 comitant well-defined suture lines, taken in connection with the 

 shape of the calyx, will serve to distinguish this from the associated 

 species in this group. 



From the Lower Niagara Limestone, Lockport, N. Y, 

 The types of the species are all in my collection. 



EXPLANATION OF PLATE IIL 



Fig. 1. Callicrinus acanthimts n. sp. a, Lateral view of calyx (restored). 

 h, Base of calyx restored. 



* 



Fig. 2. Callicrinus miirckisoniamis Angelin (after Angelin). Upper Silurian 

 Gothland, Sweden. For comparison with the above. 



Fig. 3. Eucal yptocrinus muralis n. sp. 



Fig. 4. Glyptaster (Eucrinus) lockportensis n. sp. Portion of an individual 

 preserving the base and first few plates of the posterior side. 

 a, Another specimen showing the posterior inter-radial area, except 

 the basal plates. 



Fig. 5. let hy or rill us conoideus n. sp. Side view of type, a, Diagram of base 

 of same. 



Fig. 6. Demlrocrinus nodibraddatus n. sp. Anterior side of type, a. Posterior 

 side of calyx of same specimen, b, Portion of the ventral tube of 

 another specimen. 



