— 143 — 

 Tafel 22. Gestein von Santa -Monica, Californien. 



1* 



2 Aulacodiscus Comberi Arn. 





3 



* 



angulatus Grev. 





4 



s 



convexus Gr. et St. 





5 



= 



margaritaceus Ralfs. 





6 



i 



amoenus Grev. 





7 



z 



pulcher Norm. 





8 



s 



convexus Gr. et St. 





9 



s 



angulatus Grev. 





10 



i 



margaritaceus Ralfs. 





11 



* 



Oreganus Bau. 



2. 



1 



Aulacodiscus Kittoni Arn. 





2 



* 



pulcher Norm. 





3 



s 



Kittoni Arn. 





4 



Auliscus speciosus A. Schm. 





5 Triceratium formosum Bright. 





6 



* 



arcticum Bright. var. 



*7 



-8 



Triceratium 





9- 



-11 



* 



Montereyi Bright. 



12- 



-13 



- 



arcticum Bright. 



3. 



1 



Triceratium arcticum Bright. 





2 



* 



formosum Bright. 





3 



s 



consimile Grün. 



4 



-5 



s 



arcticum Bright. var. 





6 



* 



quinquelobatum Grün 





7 



SS 



parallelum Grev. 



8 



-9 



= 



heteroporum Grün. 



10- 



-11 



s 



punctatum Bright. 





12 



1 



Browneanum Grev. 





13 



i 



Brightwellii West. 





*14 Triceratium 







15 



# 



heteroporum Grün. 





16 



* 



inelegans Grev. 



*17- 



-20 Triceratium 





4. 1 — 4 Triceratium elegans (Grev.) 

 5 — 6 Isthmia nervosa Kg. 



7 Biddulphia multicornis Grün. 

 8 — 10 Cerataulus turgidus Ehr. 

 *11 Cerataulus 



