164 William Hellier Baily 



tubes of a gregarious Annelid, allied to Sabella (Jour. Geol. Soc. 

 of Dublin, vol. viii. (1859), p.p. 116-118., figs. 1 and 2), appears 

 to us to be scarcely definite enough to warrant its retention 

 amongst the fossils of this formation. 



Figures and more detailed descriptions of these fossils are given 

 in the Journal of the Geological Society of Dublin (loc. cit), the 

 Transactions of the Royal Irish Academy, vol. xxiii. (1858) ; 

 in the Geological Magazine, 1865, p. 385, <fcc. ; and in the 

 Explanation to sheets 121 and 130 of the maps of the Geological 

 Survey of Ireland ; a good series, including some of the figured 

 specimens, being contained in the Geological Survey Collection, 

 Royal College of Science, Dublin. 



List of Cambrian Fossils. 



Plantce or Hydrozoa. 



Oldhamia antiqua (Forbes), Bray Head, Carrick Mountain, County 

 Wicklow; Howth, Co. Dublin. 

 „ radiata (Forbes), Bray Head, Greystones, Co. Wicklow. 



Histioderma Hibernica (Kinaha/i), Bray Head, Carrick Mountain, 



Dublin. 

 Arenicolites didymns (Salter) \ Probably identical, Bray Head, 

 „ sparsus (Salter) / Carrick Mountain. 



Lower Palaeozoic Rocks, containing Caradoc-Bala species 

 have been observed at several places near Rathdrum, in the 

 County of Wicklow : more particularly at Rathdrum Hill, the 

 Quarry near Rathdrum Bridge, and at Slieveroe. The follow- 

 ing is a list of the fossils collected by the Geological Survey in this 

 district : — * 



[The prefixed asterisks are intended to represent the comparative 

 abundance of the species.] 



Actinozoa : Corals. 

 **Favosites fibrosus, branching and hemispherical varieties. 



Mollusca : Brachio])oda. 

 Discina perrugata 1 

 Leptama Grifnthiana, new species (Davidson). 



„ sericea. 

 Orthis calligramma. 



,, elegantula. 

 Lingula brevis ? 



* Explanation to sheets 121 and 130 of the maps of the Geological Survev of Ireland 

 p. 16. . 



