334 'i'HE GEOLOGV OF THE LABRADOR COAST. 



Cardita borealis Bela exarata, 



Astarte Banksit, Bela woodiana, 



Margarita varicosa, Bela robusta, 



Turritella recticulata, Bela americana^ 



Turritella erosa, Fusus tortuosus, 



Aporrhais occidentalis, Fusus labradorensis, 



Admete viridula, Buccinum tmdulatum, 

 . Tritonofusus cretaceus. 



From this list the polyzoa are excluded, since no spe- 

 cies are recorded from Greenland, except by Otho Fa- 

 bricius in the Fauna Gronlandica. 



Upon comparing this list with that of the species 

 comprised in the present fauna of Labrador, we can ob- 

 serve how similar are the two faunae, and how persistently 

 the characters of the earlier of the two have survived the 

 important changes this region has undergone since the 

 glacial epoch. We have here the present Syrtensian* or 

 Newfoundland Banks fauna in its purity, without the 

 intermixture of the few southern forms that have subse- 

 quently encroached upon its limits. We shall below 

 show where it shaded almost imperceptibly into the 

 Acadian fauna, its nearest southern neighbor ; but now 

 we have to determine its most northern limits. 



Fortunately Moller, in his " Index Molluscorum 

 Gronlandiae," and Rink,f have noticed the few fossils 



* We have applied the term Syrtensian to the subarctic assemblage of marine 

 animals characterizing the Banks of Newfoundland, of Nova Scotia, and the 

 coast of Southern Labrador and of Newfoundland. It is a subdivision of the 

 Arctic fauna, being in some respects intermediate between the Arctic and Bo- 

 real faunse. 



f Udsigt over Nordgronlands Geognosi af H. Rink. Viden. Selsk. Skrifter, 

 Kjobenhavn, 1853, p. 96. The species were identified by Dr. O. A. L. Morch. 



