296 bulletin: museum of comparative zoology. 



twenty-five feet in thickness and all apparently belong to the Lower 

 Lyckholm. The lowest beds Seen appear to be those of Hohenholm 

 and Taps. 



The best present collecting localities for the lower divisions of this 

 formation are Paope and Pallokiill, both on the island of Dago. At 

 these two places the quarries are in operation and new exposures are 

 constantly being made. Other localities in addition to those men- 

 tioned where the lower beds appear to outcrop are Neuenhof, Od- 

 dalem, Saximois, Sutlep, Forel, and Kirna. 



Characteristic fossils of the Lower Lyckholm are Pseudolingvla 

 quadrata, Porcnnbonites gigas, Triplecia iiisidaris, Subidites gigas, and 

 Salpitigostoma dilatatum. The species which are knowTi to occur in 

 the lower portion of the Lyckholm are : — 



1. Calapoecia canadensis Billings. 



2. Clathrodictyon cf. vesiculosum Nicholson and Murie. 



3. Columnaria fascicula Kutorga. 



4. Halysites catenularia (Linne). 



5. escharoides (Lamarck). 



6. Paleofavosites asper (d'Orbigny). 



7. Proheliolites dubius Schmidt. 



8. Streptelasma cf. corniculum Hall. 



9. Syringophyllum organum Linne. 



10. Anaphragma mirabile Ulrich and Bassler. 



IL Ceramopora intercellata Bassler. 



12. Chilotrypa immatura Bassler. 



13. CorynotrN-pa abrupta Bassler. 



14. barberi Bassler. 



15. dissimilis (Vine). 



16. Dianuhtes coUiferus Bassler. 



17. grandis Bassler. 



18. sulcatus Dybowski. 



19. Dittopora colliculata (Eichwald). 



20. Diplotrypa petropolitana Nicholson. 



21. Glauconema plumula \Yiman. 



22. Hallopora elegantula (Hall). 



23. Monticulipora dagoensis Bassler. 



24. Nematopora fragilis L'lrich. 



25. Orbignyella expansa baltica Bassler. 



26. Orbipora fungiformis Eichwald. 



27. Pachydictya bifurcata (Hall). 



