twenhofel: expedition to the Baltic provinxes. 335 



13. Ptilodictya lanceolata. 



14. Camarotoechia nucula (Sowerby). 



15. Chonetes striatellus. 



16. Leptaena rhomboidalis. 



17. Retzia salteri. 



18. Rhynchonella diodonta Dalman. 



19. Spirifer elevatus. 



20. schmidti Lindstrom. 



21. Strophomena filosa Sowerby. 



22. Spirorbis imbricatus, 



23. Autodetes calyptratus (Schrenck). 



24. Euomphalus? catenulatus Wahlenberg. 



25. cornuarietis Wahlenberg. 



26. Holopella obsoleta Sowerby. 



27. Pterinea retitulata Hisinger. 



28. retroflexa Wahlenberg. 



29. Orthoceras bullatum Sowerby. 



30. Calymene intermedia Lindstrom. 



31. spectabilis. 



32. Proetus conspersus. 



Farther southwest on the same coast is the Ohhesaare Pank in 

 which strata of about ten feet in thickness are exposed, consisting of 

 interstratifications of gray and red sandy limestones and calcareous 

 shales of various shades of brown, the latter dominating in the middle 

 of the section. The sandy limestones contain many small remains of 

 fishes, while the shales carry numerous pelecypods of which Grammysia 

 cingulata Hisinger is probably the most abundant. The invertebrate 

 fauna is quite similar to that of Kaugatoma Pank, but the presence 

 of fish remains and the absence of crinoids are marked features of 

 difference. These differences are probably to be referred to differ- 

 ences in the ecologic facies during the times of sedimentation. The 

 complete fauna from Ohhesaare Pank is as follows : — 



1. Favosites cristatus. 



2. forbesi. 



3. Trachypora porosa Dybowski. 



4. Dianulites elegantulus Dybowski. 



5. Hallopora elegantula. 



6. maculata (Dybowski). 



7. Ptilodictya lanceolata. 



8. Chonetes striatellus. 



