PATE I 
Figure 1. Pectoral fin, type of Cælacanthus banffensis; natural size. 
Figure 2. One of the principal fin-rays showing the general shape and close articu- 
lation; twice the natural size. 
Figure 3. A few of the articulated joints of the same; four times the natural size. 
Figure 4. Cycloid scales, preserved with the fin, showing the ornamentation of 
the outer surface; twice the natural size. The particular scales figured are 
those shown at a in figure 1. 
