Index. 



283 



Old Red Sandstone, 73 

 Ordovician rocks, 70 

 Orthoptera, 216 



Ropeworks, 47 

 Rotifera, 229 

 Round towers, 256 



Pantopoda, 221 

 Peat, 91, 92 

 Pisces, 172 

 Phanerogamia, 106 

 Physical features, 57 

 Plateau, basaltic, 59 

 Platyhclmia, 230 

 Pleistocene deposits, 

 Polyzoa, 229 

 Porifera, 236 

 Portrush Lias, 83 

 Protozoa, 238 



Quartz felsite, 99 



Raised beaches, 90 

 Rathlin Island, 67 

 Raths, 253 

 Reptilia, 171 

 Rh^etic rocks, 81 

 Rhyolites, 97 

 Rivers, 62 

 Rock salt, 56, 79 



Salt, 56, 79 

 Sand dunes, 92 

 Scrabo Hill geology, 78 

 Shipbuilding, 42 

 Silicified wood, 66 

 Silurian rocks, 70 

 Souterrains, 249 

 Standing stones, 244 

 Stone circles, 248 

 Strangford Lough, 6r 



Tardree rhyolites, 97 

 Tertiary rocks, 87 

 Tobacco factories, 49 

 Toome kiesulguhr, 92 

 Triassic rocks, 77 

 Tunicata, 185 



Vascular cryptogams, 106 

 Vertebrata, 148 



Waterloo, geology, 81 



