15 
Explanation op Plate I; 
Ottawacrinus typus. 
Fig. 1. The crown from the right side. X 3 diam. 
“ 2. The crown from the left side. X 3 diam. 
“ 3. Analysis of the cup. X 3 diam. 
se 4. Isolated arm-fragment, showing an axillary. X 3 diam. 
“ 5 . Separate shale-fragment with portions of arms and of anal tube. The arm on 
the left is seen from its outer face, that on the right from its inner face; 
there are traces of covering-plates in the ventral groove. In this arm the 
fourth brachial from the lower end Is axillary. The plates of the anal tube 
are mostly seen from their outer faces; but at the top left-hand corner, 
some are seen from the side and show the bevelling of their joint-face3. 
X 6 diam. 
“ 0, Joint-face of a columnal from the median region. X 6 diam. 
“ 7. Joint-face of columnal pentameres from the distal region. X 6 diam. 
“ 8» Section across stem in the proximal region, i.e. at the end of the fragment 
shown in Fig. 1. X 6 diam. 
“ 9. Side-view of a portion of the stem from about the middle region, to show the 
precise relations of the pentameres. X 6 diam. 
Drawn by G. T. Gwilliam, F.R.A.S, 
