Plate IV. 



Page 

 Fig. 1. Solenopora sp., tangential section, X 56 . . . . 9 



Fig. 2. — „ longitudinal section, X 16 . . ... . 'J 



Fig. 3—4. Parallelopora favositiformis nov. gen. ct sp., tangential and longi- 

 tudinal sections, X 2 . . .... . . 13 



Fig. .5 — 6. Favosites forbesi E. and H. var. eifelensis Nich., tangential and longi- 

 tudinal sections, X 2 . . . .... . ... .... 11 



Fig. 7. Cladopora rectilineata Simps, on a slab, nat. size . . . .14 



