Fig. I b. 



Fig. 2. 



Fig lc 



Quart. Journ. Geol. Soc. Vol LXVII, Pl XL. 



Fig. Id. Fl £ le - 



compare 



Fig. la. 



F& 6b. 



J. W. Tutchcr, Photo. Bemrose Ltd., Cello., Derby. 



AVONIAN CORALS from D 2 and D 2 _ 3 GOWER. 



(* COMPARATIVE FORMS.) 



