Report of U. S National Museum, 1901. 



Plate 66. 



In most crinoids there is inserted in an interradius one or more extra pieces called 

 anal fteus (colored red). The anal mtv when present (colored blue), is supported by the 

 3oal plates. The anal afrnitig (colored brown), may be in the side, or at the apex of the 

 tube. 



»«t77»- Cactocrinus oraathwlmus. Lower Carbonic. Showing the anal rube between the brachia. 



a*,lol. ScaphiocrmuB unicus. Lower Carbonic. Showing the anal lube with the anal opening in the side. 



>4i'91- Scytnlocrinua rabustuj. Lower Carbonic. 



•7,«M. AMMCrinua m«gm«cu«. Upper Carbonic. The brachia have been removed. 



Crinoid Series— the Anal Area. 



