428 Mr. C. Lapworth on the Geological 



The second or Ardmillan Division of the Girvan rocks is 

 composed of the four successive subgroups of the Pinmore, 

 Tralodden, Shalloch, and Drummuck beds. The Pinmore 

 beds have yielded me 



Dicranograptus ramosus, Hall. Diplograptus tricornis, Carr. 



Dicellograptus nioffatensis, Carr. Climacograptus Scharenbergi, 

 Leptograptus flaccidus, Hall. Lapio. 



Diplograptus foliaceus, March. caelatus, Lapw. 



euglypbus, Lapio. 



The Tralodden beds afford 



Dicellograptus elegans, Carr. Diplograptus truncatus, Lapw. 



Forcbhammeri, Geinitz. quadrimucronatus, Hall. 



Morrisi, Hopk. Climacograptus bicornis, Hall. 



complanatus, Lapw. tubuliferus, Lapw. 



Diplograptus foliaceus, Murch. Idiograptus aculeatus, Lapw. 

 socialis, Lapw. 



The Shalloch or Nematolites-beds yield only a few speci- 

 mens of 



Dicellograptus Morrisi, Hopk. Diplograptus truncatus, Lapio. 



Diplograptus foliaceus, Murch. Idiograptus margaritatus, Lapw. 



The Drummuck beds are also very poor in Graptolites. 

 The only forms hitherto collected from them by Mrs. Gray 

 or myself include 



Dicellograptus anceps ?, Nich. Diplograptus truncatus, Lapw. 



Ireland. — The central member of the Black Graptolitic 

 shales of county Down has yielded to the industrious re- 

 searches of my friend Mr. William Swanston the following 

 Hartfell species : — 



Leptograptus flaccidus, Hall. Climacograptus bicornis, Hall. 



Dicellograptus caduceus, Lapw. Scharenbergi, Lapw. 



mofFatensis, Carr. tubuliferus, Lapw. 



Forchbammeri, Geinitz. Retiolites fibratus, Lapw. 



Morrisi, Hopk. Diplograptus truncatus, Lapw. 



Dicranograptus ramosus, Hall. foliaceus, Murch. 



Clingani, Carr. quadrimucronatus, Hall. 



Nicholsoni, Hopk. tricornis, Carr. 



Sweden. — The Swedish Graptolite-bearing rocks that corre- 

 spond to the Llandeilo and Bala strata of Britain are the 

 Middle Graptolite- Schists of Linnarsson (Dicranograptus- 

 Schists of Dr. Tornquist) and the overlying Trinucleus- 

 Schist. These beds repose at once upon the Orthoceras-Lime- 

 stone (Arenig), and are surmounted by the Br achiopod- Schists 

 (Llandovery) that form the basal formation of the Swedish 

 Silurian proper. According to the most recent communica- 



