114 CLEIOCPJNUS. 



Cleiocrinus magnificus Billings. 



Fig. 11. A flattened calyx, with small part of stem attached, — specimen E of text. On 

 the opposite side of the specimen the bases of thirtj'-five arms can be seen in 

 a distance of about one-third the perimeter of the rim, but the calyx plates are 

 only faintly discernible. 

 12. The unflattened portion of a stem fragment about seven inches long. The thin- 

 ness of the columnars in this large stem is extraordinary, and the same thing 

 is shown in Billings's Fig. 3 of another fragment. 



Glyptocrinus dyeri Meek. 



Fig. 13. Specimen from the Hudson River Group at Cincinnati, Ohio, to show the manner 

 of fixation of pinnules by growth of supplementary plates. 



Reteocrinus o'nealli Hall. 



Fig. 14. Specimen from same horizon at Lebanon, Ohio ; to show the structure of arms, 

 pinnules, and the anal area. X 3 /- 2 . 

 15, 16. Posterior views of calyx of other specimens, showing the elongate anal series 

 and the numerous small interbrachial plates bordering them ; also the pliant 

 and contorted tegnien. Fig. 16 shows the anal opening, x 2. 



17. Anterior view of another specimen, showing the structure of the interbrachial 



areas, and fixation of pinnules, x 2. 



18, 19, 20. Specimens showing different forms assumed by the pliant tegnien ; no 



anal opening visible. X 2. 

 21. Another specimen showing the same structures, and the anal opening. From 



Morrow, Ohio. 

 (All the specimens of Cleiocrinus are in the Museum of the Geological Survey of 

 Canada, at Ottawa. The others belong to the author. All figures natural size unless 

 otherwise stated.) 



