EXPLANATIONS OF PLATES. 



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PLATE 1. 



Fig. 1. Platycrinus eriensis, enlarged two diameters : page 119. 



Fig. 2-4. Myrtillocrinus americanus, enlarged two diameters. 

 2 and 3, lateral views; 4, basal view. Page 142. 



Fig. 5-9. Haplocrinus clio, enlarged six diameters : p. 143. 



5 and 6, lateral views, showing one ray of two plates and another of one 

 plate; 7, base of same; 8, view of summit of same; 9, lateral view of another 

 specimen, showing the first plate of the arm on one ray. 



Fig. 10. Pentremites maia : p. 150. 



Fig. 11. Pentremites leda : p. 149. 



Fig. 12 & 13. Codaster pyramidatus : p. 152. 



Lateral and summit views. 



Fig. 14 & 15. NucLEOCRiNUs elegans : p. 147. 



14, lateral view; 15, enlargement of one interambulacral space, with the 

 adjacent poral plates. 



Fig. 16. NUCLEOCRINUS LUCINA : p. 148. 



Fig. 17. Cheirocrinus clarus : p. 116. 



View of an entire individual, natural size : the root is attached to a frag- 

 ment of a column of another crinoid. 



Fig. 18. Koots, apparently of Cheirocrinus, attached to other crinoid 

 columns. 



Fig. 19 - 22. Cyathocrinus bulbosus : p. 123. 



19, basal view, with part of one arm shown ; 20, lateral view showing height 

 of body, a small part of one arm remaining attached ; 21 , upper side of a 

 small individual, showing the central cavity and the spreading and broadly 

 grooved arms; 22, exterior view of the spreading arms of a larger individual, 

 from which the body has been broken off. 



Fig. 23 & 24. Edriocrinus pyriformis : p. 116. 



23, lateral view; 24, view of the summit of the specimen. 



Fig. 25 & 26. Ancyrocrinus bulbosus : p. 118. 



25, a large specimen preserving about seven inches of the column attached ; 

 26, a young individual. 



Fig. 27 & 28. Ancyrocrinus spinosus : p. 119. 

 27, lateral view; 28, view of summit. 



