Palaeocrinus striatus Billings 



Fig. I Ten diameter enlargement of area over 1. ant. IB 



2 Same area as photographed under a mounting of gum 



dammar 



3 Ten diameter enlargement of area around upper angle of 



r.post.B. The probable path of the right-hand branch of 

 the oldest b.v. is indicated by four dots on r.ant.R 



4 Same area as it appears under a mounting of gum dammar. 



The curved bands of light and shade which appear near 

 the corners of the two lower figures are due to refraction 

 and reflection from the edges of the drying gum 



268 



