same collection (as shown in our figures) as to size. The large pores 

 are about 5 mm. deep and strongly glaucous. 



Fig. 311 

 Hexagona atrosanguinea. Type at Berlin. 



Fig. 312 

 Hexagona Sacleuxii. Type at Pai 



This is known from three collections at Paris, all from Africa. The pores 

 are deeper than others of this group, otherwise it is close to rigida. The 

 variation of pore sizes in the same collection is unusual, and I am not sure 

 but that it is due to different ages. The large pores are strongly glaucous, the 

 small pores not at all. 



28 



