Notices of Memoirs — Notes on Rochall Island and Bank. 163 



Okeford Fitzpaiue, Dorset.' The proof which it was supposed to 

 give of the absence of that zone at Richmond consequently falls to 

 the ground. 



In conclusion, I have to express my sincere thanks to Mr. G. C. 

 Crick for his ever ready help to me in the identification of 

 Cephalopods ; to Mr. F. Chapman for identifying the forarainifera ; 

 and to Dr. Hinde for kindly sending me the fossils collected at 

 Battlebridge to examine. 



isTOTiOES OIF nvcEnvLOiias, 



Notes on Eockall Island ani> Bank. With an Account of the 

 Petrology of Eockall, and of its Winds, Currents, etc. ; with 

 Eeports on the Ornithology, the Invertebrate Fauna of the Bank, 

 and on its previous History. Transactions of the Eoyal Irish 

 Academy, vol. xxxi (1897), pt. 3, pp. 39-98, with plates ix-xiv. 



THIS memoir contains the results of an exploration carried on 

 under the direction of the Eev. W. Spotswood Green, of the 

 Irish Fisheries Board, with the assistance of Mr. Harvie Brown, 

 Mr. E. M. Barrington, and a committee of the Eoyal Irish Academy. 

 In June, 1896, the s.s. " Granuaile," of the Congested Districts Board, 

 made two visits to the Eockall Bank, but none of the party of 

 naturalists on board of her were able to effect a landing upon 

 Eockall itself, though some interesting sketches and photographs 

 were made of it, and valuable collections obtained from the 

 surrounding seas. 



The Eockall Bank is situated in the Mid-Atlantic, and it is 

 separated from the plateau on which the British Islands stand by 

 seas having a depth of from 1,300 to 1,600 fathoms. The bank is 

 150 miles long from N.E. to S.W., by about 50 miles wide, within 

 the 200-fathom line, and about half that extent within the 100-fathom 

 line ; it is resorted to by fisbing-craft at certain seasons, but the 

 amount of fishing carried on there has not been so great as was at 

 one time anticipated. 



Eockall itself, which is situated in lat. 57° 36' N., long. 13° 42' W., 

 is said by Captain Basil Hall to be " the most isolated speck of rock 

 in the world." It is 240 miles distant from the Irish coast, 290 miles 

 away from the nearest point of Scotland, and 170 miles from 

 St. Kilda. It is only about 250 feet in circumference at its base, 

 and about 70 feet in height. At a radius of 2J miles from the rock 

 the depths are from 40 to 70 fathoms, but within this area two other 

 small rocks rise nearly to the surface of the sea. ' Haslewood 

 Eock ' is a small half-tide detached rock, bearing N.E. by N. 

 IJ cables from Eockall, and 'Helen's Eeef (so called from a vessel 

 that was wrecked upon it) is If miles E. by S. from Eockall, and 

 has about six feet of water upon it at low- water. 



It has sometimes been suggested that Eockall might form an 

 invaluable position to be utilized for a lighthouse or a meteorological 



1 Geol. Mag., Dec. IV, Yol. Ill (1896), p. 200. 



