Palaeontographica Bd. XXI, N. F. I. 



Taf. XLI. 





SMotterbeci- cid. at nht. 



1. Thamnastraea major Beck. — 2. Th. speciosa -Beck. — 3. Th. prolifera Beck. 



4. Dimorphastraea concentrica Beck. — 5. Dimorph, fallax Beck. — 6. Dimorph. 



helianthus Beck. 



