Proc. Roy. Soc. Edin.] 
[Vol. XXXII. 
Specimen 2, Text fig. 5, nat. size. — Cherty Encrinital Limestone. The dark 
“manganese” stain, indicated by arrow, marks the line between the embedded 
and exposed surfaces. 
Dk B. N. Peach. 
[Plate VI. 
