406 Scientific Proceedings, Royal Dublin Society. 



OPHYTES. 



[Dark-green to blackish, some striated and spotted. Occur in the Cos. Galwayv 

 Mayo, Sligo, Tyrone, Waterford, Wexford, and Wicklow.] 



GrALWAY. 



To the north of the townland of Leamnaheltia, near the south 

 shore of Lough Fee, in the mountainous tract north of Kylemore 

 Lough, is an isolated mass of ophyte of dark, and in places lighter 

 clouded greens. Some pieces of this rock were worked by Alick 

 M'Donnell of Clifden, who stated " the rock was very kind." 



At Dawros, to the east of Ballynakille Harbour, and a little 

 north of Letterfrack, there is an extensive tract of dark-green,, 

 nearly black, ophyte. 



To the south and south-west of Grarroman, or Grlendollagh 

 Lake, are small tracts of dark-green ophyte. 



Near the shore of Galway Bay, about half a mile south-west of 

 the ruins of Bunowen Castle, is a small tract of dark-green, nearly 

 black, ophyte. 



In the mountainous tract of Errisbeg, to the westward of 

 Roundstone, are three rather long tracts of ophyte. Two are- 

 near Lough Bollard, while the third is a little more than half a 

 mile to the east of it. The stone in general is dark-green, but 

 some of it is mottled, dark and light. 



Mayo. 



Two miles north of Oastlebar there is a long narrow exposure 

 of dark to light-green ophyte. 



Along the northern slope of the Croagh Patrick range, from 

 near Louisburg to some miles east of Westport, is a long wide 

 tract of ophyte associated with steatyte. To the westward it thins 

 out, while its greatest thickness appears to be at the railway cutting 

 a mile and a-half south-east of Westport. Some surface-specimens 

 were experimentalized on and were found difficult to cut ; but it 

 might improve if opened in depth ; it appears worthy of trial, as it 

 varies much in colour, from greenish-black to dark-green, light- 

 green, reddish, and purplish ; some of it being handsomely streaked 

 with the colour last mentioned. 



