384 H. S. WILLIAMS CORRELATION* PROBLEMS 



catuSy several of which, as has before been mentioned, do not belong to 

 the Edmunds fauna, but do belong to 'the Rochester shale fauna of Xew 

 York. 



EDMUNDS SPECIES IN THE GOTLAND SECTION 



Following the distribution of Wenlock specks from England eastward 

 to the Gotland section, we find all of the 7 significant Edmunds species 

 listed from the "Medel Gotland" formation by # Lindstrom. 8 



It is to be noted regarding this Gotland section that the fauna! and 

 stratigraphic sequence has been more fully- determined by later studies. 



Hedstrom, in his review of the Silurian for-#ie International Congress 

 of 1910, showed that there are in the GotlarjJLsection two separate hori- 

 zons at which Pentamerus galeatus appears^-In the Lower Gotlandian, 

 "Lower Cliff level number II" of Hedstrorn,. Pentamerus galeatus ap- 

 pears with Dinobolus davidsoni, Atrypa imbricata, RhynchoneUa b ore- 

 alls, cuneata, sph&rica, Ortliis biloba, 0. hybrida, Spirifer plicatella, and 

 Plectambonites transversalis, thus combining the Edmunds and Koch- 

 ester peculiar species as in the English Wenlock. In the highest zone, 

 "zone VII" (called by Hedstrom "genuine Upper Gotlandian"), Penta- 

 merus galeatus is again recorded in connection with such other species as 

 Ortliis elegantula, Spirifer plicatella, RhynchoneUa wilsoni, and it in- 

 cludes also Haly sites catenularius ; but this fauna does not contain the 

 characteristic species Plectambonetes transversalis, RhynchoneUa cuneata, 

 or Orthis bilopa of the Rochester shale. 



THE BOHEMIAN FAUNA E* 



In the fauna E 2 of Barrande, from Bohemia, we find the following 

 British Wenlock species definitely recognized by name: 



Atrypa linguata Bucb. Retzia harranclei Davidson. 



Atrypa marginalis Dalm. RhynchoneUa cuneata Dalm. 



Atrypa reticularis Linne. RJiychonella defle.ra Sow. 



Cyrtia exporrecta Wahl. Spirifer sulcata,? His. 



Leptama transversalis Wahl. Strophomena euglypha His. 



Meristella tumkla Dalm. Strophomena funiculata McCoy. 



Orthis elegantula Dalm. strophomena pecten Linne\ 



Pentamerus linguifcr Sow. Strophomena rhomboid alis Wilck. 



Besides these a large number of species of the genus Spirifer, given 

 new names but belonging to the group of the Radiati, both the plicate 

 and the non-plicate forms, such as in England are called Spirifer rarlia- 



8 G. Lindstrom : Bidrag till Kannedoraen om Gotlands Brachiopoder. Ofversigt af. 

 Kgl. vet. Akad. Forhandlinger, 1860, pp. 380-382. 



