PLATE ii 

 Rhipidomella numus Clarke 



Page 47 



i, 2 Opposite sides of a young example, x 3 



3 A shell of average proportions 



4 Interior of a ventral valve 



5, 6 Opposite sides of an average shell 

 7-9 Three views of an uncompressed specimen 

 10-12 Three views of a well preserved shell enlarged y 2 diameter to 

 show the character of the surface 



Orbiculoidea sp. 



Page 48 



13, 14 Two pedicle valves 



Marine alga ? 



Page 51 



15 Small fragment of a frond, x 5 



16 A rock surface bearing a mass of these filaments 



1S8 



