REPORT OP A VISIT TO SANDA AND GLUNIMORE. 201 



species [PI. III.], of which a successful photograph was taken by- 

 Mr. John Fleming. Mr. John Robertson had the good fortune to 

 raise a Black Guillemot (Uria grylle (Linn.)) from her nest and 

 two eggs in a crevice of the rock. Only a pair of birds of this 

 species was seen in the neighbourhood of Glunimore. Mr. Gray, 

 in The Birds of the West of Scotland, d'C, in enumerating its 

 breeding places on the West Coast, mentions Arran as one 

 (p. 427), but on the following page he says — " A few pairs are 

 seen in the Firth of Clyde, and occasionally a stray bird is 

 detected in the vicinity of Ailsa Craig. I have hitherto failed, 

 however, to ascertain that it breeds there." In the Zoologist, 

 February, 1894, Yol. XVIII., p. 55, Mr. Eobert Service states 

 that " it breeds at Ailsa Craig," but gives no particulars.* 

 However, even should this not prove to be the first and only 

 properly authenticated instance of the nesting of Uria grylle in 

 the Clyde area, it is at least an interesting addition to our 

 knowledge to have found it at Glunimore. 



MOLLUSCS. — In the burial-place at St. Ninian's Chapel, on 

 Sanda, Helix aspersa, Miill., was found. 



GEOLOGY, &c. — So far as was observed during our brief visit, 

 the island appears to be mainly composed of sandstone and con- 

 glomerate, with thin beds of shale, and a band of cornstone 

 towards the north-east. 



The strata dip at a high angle to the south, 40° in the eastern 

 part of the island, as seen at Elbow Point, and 30° farther west, as 

 seen near the lighthouse, which is situated at the extreme south 

 on a projecting point formed by a high rock, called the Ship Pock, 

 from its resemblance to a ship under sail. The conglomerate, 

 being harder than the sandstone, has, of course, been less worn 

 away by denuding agents, and forms ridges in the central part of 

 the island, where it alternates with sandstone and shale, while in 

 the eastern part it rises to the height of 405 feet above sea-level. 



* Mr. Service writes, that though he certainly saw the Black Guillemot at 

 Ailsa several times on the occasion of his visit, he can recall, at the time of 

 writing, no more definite authority for its breeding on the Craig than the 

 statements of Gray {Birds of Ayrshire and Wigtownshire, p. 49). Gray, 

 alluding to the Scaur Rocks and Ailsa Craig, says that it is "probably a 

 native of both places." 



