Bull. Br. Mus. nat. Hist. (Geol.) Suppl. 4 



PLATE 20 



WbB^3Bc^*HStiE 





■■ ^^.^rBur Bl B ' Mfs^k^k bC-^B B7J> ^b 

 BLyy V**LdH Br' ■ ■ K 1 orasnu 





