50 SMITHSONIAN INSTITUTION 



PLATE XXII 

 (All figures natural size except where otherwise stated) 



PAGE 



Figs. 1-4. Forbesiocrinus nobilis De Koninck and Le Hon 249 



(Also on Plates XXI, XXIII and XXIV) 



Fig. la. The principal type specimen, on which the generic description and diagram were chiefly 

 based ; original of the author's fig. 26. Copied, with some corrections of the anterior 

 radius not properly shown in their figure, from De Koninck and Le Hon, Crin. Carb. 

 Belg., pi. 2, fig. 2b. Anterior view ; the specimen is much flattened, and the anterior 

 ray mostly broken away; interbrachials to the height of the axillary IBr are seen to 

 the left. Musee d'Histoire Naturelle, Brussels. 



lb. Posterior view (not figured by De Koninck and LeHon). Shows the angular posterior 

 basal, with a few anal plates succeeding. The additional plates in the anal interradius 

 shown by the generic diagram (fig. 2) cannot be identified in the specimen. 



ic. Right posterior interradial view at the narrow compressed edge of the specimen, showing 

 interbrachials, crowded together and pushed higher than their normal level. 



id. Left posterior interradius, with smaller number of interbrachials pushed by pressure into 

 a vertical series. 



2. Generic diagram of De Koninck and LeHon (Recherch. Crin. Carb. Belg., 119). 



3. Cotype, original of authors' fig. 2a; after De Koninck and Le Hon. This specimen in the 



Museum d'Histoire Naturelle, Paris, could not be located until after this plate was pre- 

 pared. When finally discovered, through the kind offices of Professor Boule, it was 

 found not to present any further definite structural details than are shown by the 

 original figure, which I had already copied. 



4. Fragment of IBr of smaller specimen, with somewhat finer surface marking. Author's 



collection. 



Lower Carboniferous, Tournai Stage. Tournai, Belgium. 



