136 SMITHSONIAN INSTITUTION 



PLATE LXV 

 (All figures natural size) 



PAGE 



Figs. 1-7. Onychocrinus diversus Meek and Worthen 423 



(Also on Plate LXVII) 



Fig. I. The principal type specimen, with one complete ray, and three others partly preserved; 

 dorsal view. Main rami with ramules branching alternately in clusters; joined for 

 four ranges of brachials. Mus. Comp. Zool. 



2. Cotype in same collection, after additional cleaning; ventral view showing infolding of 



distal ends of ramules. The posterior oral and displaced fragments of ambulacra 

 are preserved, but the remainder of the tegmen is destroyed. 



3. Dorsal view of a mature specimen, with rays extended so as to show the exact mode of 



branching of ramules. Terminal rami of r. post, ray partly restored from another 

 specimen ; r. ant. ray abnormal and probably recuperated. Author's collection. 



4. Posterior view of another specimen with rays not extended, showing the posterior basal, 



and origin of anal tube. Author's collection. 



5. Young specimen, horizontally extended, with rami joined only to the second range above 



axillary; dorsal view. Some ramules partly restored in outline from another 

 specimen. Author's collection. 



6. A still younger specimen, with stem attached ; has rami united only to first range above 



axillary. Author's collection. 



7. Proximal part of stem of a very mature specimen, showing strong curvature of nodal 



columnals. Author's collection. 

 Upper Burlington limestone ; Lower Carboniferous. Burlington, Iowa. 



