INDEX. 



689 



Organisation, remarks 'respecting the Causes of, by Dr 



Barclay, - - 537 



Orkney Animal, Dr Barclay's remarks on, i. 41 8. — Not 

 synonimous with Squalus maximus, 423. — Affidavits 

 concerning it, 431. 



Ornithomyia, Generic Characters of, ii. 550. — Descrip- 

 tion of the Species, 558. 



Oxypetrum, Generic Characters of, ii. 551. — Species 

 of, 563. 



P 



Papa Stour, Mineralogical acccmnt of, by the Reverend 

 John Fleming, i. l62. — Sandstone, l64. — Slate-Clay 

 and Amygdaloid, l66. — Greenstone, l67. — Breccia, 

 l68. — Compact Felspar, 170. — Claystone, 171. — 

 Porphyritic Slaty Felspar, 172.— All the Beds of 

 Rocks in Papa Stour belong to one Formation, 174. 

 — Probably to the Independent Coal Formation, 

 175. 



Pediculi of the Gannet, i. 192. — Do not characterise 



the Species of Birds, lyS. 

 Pelecanus bassanus. — See Gannet. 



Pentland Hills, outline of the Mineralogy of the, by 



Professor Jameson, - ii. 178 



Pinna ingens of the British Zoology, elucidated by Cap- 

 tain Laskey, - i. 102 

 Pitchstone, sub-species of. In the Island of Arran, 1 1 4 



of the Middle District of Scotland, ii. 631 



Plants, list of the rarer, observed near Edinbyrghj by 



Mr Maughan, 215.— Addition to, 626. 

 Pleuronectes punctatus; description of - 241 



