400 



Blaney and Loomis — Mt. Desert Island. 



Goose Cove 



Frenchman's Bay- 



Not common. 



Very common. 



Fairly common. 

 Very abundant, 

 Rare. 



Rare. 



Common. 

 Very abundant. 



Very abundant. 

 One double valved 



Never dredged alive 

 Very common. 



specimen. 

 Rare. 



Very common. 



Common. 



Common. 



Rare. 



Very common. 



A fragment. 



Very common. 



Rather rare. 



Common. 



Rare. 



Not common. 



Common. 

 Fairly common. 



Not common. 

 Very common. 



Fairly common. 



Common. 



Two valves. 



Not found. 



One fragment. 



Not found. 



9. Cardium pinnulatum, 



Conrad 



10. Serripes groenlandicus, 



Gtnelin 



11. Macoma calcarea, Gmelin 



12. Mya arenaria, Linne 



1 3. Mya truncata, 



var. uddevallensis 



14. Saxicava arctica, Linne 



15. Bela turricula, Montagu 



16. Buccinum nndulatum, 



Linne 



17. Fusus (Chrysodomus) 



decemcostatus, Say 



18. Fusus (Sipho) pygmaeus, 



Gould 



19. Trichotropis borealis, 



Sowei'by 



20. Aporrhais occidentalis, 



Beck 



21. Lunatia groenlandica, 



Beck 



22. Lepeta caeca, Mtiller 



23. Margarita cinerea, 



Couthouy 



24. Rhynconella psittacea, 



Gmelin 



25. Terebratella spitzberg- 



ensis (?), Davidson 



Beside the above these clays contain a series of barnacles, 

 and Bryozoa, but we did not collect these in quantities suffi- 

 cient to be significant. 



The species most abundant in these Pleistocene clays, like 

 P. islandicus, the Ledas, Astartes, Mya truncata, JZhyncho- 

 nella and Macoma calcarea, are now either wanting or ex- 

 tremely rare in Frenchman's Bay, but are the common forms 

 of the Labrador coast. This whole Pleistocene fauna with 

 much the same relative abundance in the different species is 

 the typical fauna of the Labrador waters. The conditions 

 under which the Pleistocene fauna lived and those of the Lab- 

 rador waters of to-day would seem to be much the same, and 

 the sole cause of the transfer of this fauna from Maine to Lab- 

 rador has been temperature. As the Pleistocene fauna moved 

 north, a more southern fauna has taken its place. 



If the Pleistocene fauna of Maine and the recent fauna of 





