388 Dr. F. A. Bather on British Fossil Crinoids : 
1833, named Balanocrinus first by L. Agassiz (1845) on 
erroneous characters. 
It will be seen that the distinction of Balanocrinus from 
Isocrinus lies in the arrangement of the crenellae on the 
normal joint-face: “quinae striae punctulatae a centro 
versus peripheriam protensae, cum Halone seu ambitu 
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Figures 1-4. Balanocrinus didactylus. 
1. Normal joint-face. F 21948. 
2. Syzygial joint-face of epizygal with two cirrus-facets. EE. 22027. 
3. A cirrus-facet, seen from the angle of the ossicle. HE 22027. 
4, A hypozygal notch, seen from the angle of the ossicle. E 22027. 
Figures 5-7. Balanocrinus subbasaltiformis. 
Normal joint-face. E5887 6. 
. Young joint-face with more Jsocrinus character. E 426 a. 
. A cirrus-facet, seen from the angle of the ossicle. 57543 ¢, 
~ID ON 
All figures enlarged 4 diameters. 
crenato,” as Scheuchzer so well expressed it under the 
heading ‘Asteria columnaris Entrocho similis” (1702, 
‘Specimen Lithogr. Helvet.,’ pp. 2-4, pl. - figs. 1-5). Ina 
well-preserved characteristic specimen this is clearly marked, 
but there is reason to believe that in young stages, or even 
