362 Mr. C. Lap worth on the Geological 



Silurian System [Upper Silurian of ' Murchison). 

 Valentian or Llandovery- Tar annon Formation. 



Table VII. Showing the Range of the Lower (and Middle) 

 Valentian Rhabdophora. 



t The Rhabdophora enumerated in the first two columns of this table 

 have been identified by myself in a collection of fossils recently obtained 

 from the comparatively barren Silurian strata of Cardiganshire (the 

 Lower Llandovery of the Survey publications) by Professor Keeping, 

 who has generously permitted me to anticipate here the publication of 

 this most important discovery. To the Graptolithologist this list is, 

 indeed, most valuable ; for no Rhabdophora have hitherto been quoted 

 from the undisputed Llandovery strata of Wales. 



