170 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW, 



XXII. 



NOTES ON THE ALG^ OF THE KILDONAN 

 SHORE, ARRAN 



BY DAVID GREGORSON, F.E.I.S. 



[Read 24th February, 1SS5.] 



The following notes are the result of a few days 

 observation in the month of July last year. They 

 are therefore limited in their extent, and so far 

 imperfect in their character. The observations were 

 not made under the most favourable circumstances, 

 as the month of July is not the most suitable 

 period for collecting many of the species ; and the 

 time at my command was too limited to enable me 

 to take advantage of every favourable opportunity, 

 even in that month. I Avas also without some of 

 the apparatus necessary for successful work, such as 

 means of dredging, &c. ; and I had to take only 

 those specimens that were cast up by the tide on 

 the shore, or could be found between tide-marks at 

 low water. I bring the result of my observations 

 before the Society in the hope that it may form the 

 basis for more extended work, and be the means of 

 stimulating others to further observation. 



The Kildonan shore lies along the south-east 

 corner of Arran, and commands a wide prospect of 

 sea, looking away out beyond Ailsa Craig. It is to 

 some extent sheltered by the island of Pladda, 

 situated about a mile from the shore. From Dippin- 

 point to Bennan-Head the cliffs of the old sea-beach 

 recede from the shore, leaving a low level strip of 

 sandy beach, with here and there flat sandstone 

 rocks, and broken up in all directions by numerous 

 trap-dykes, — thus forming a very favourable situation 

 for the growth of Algce, and affording much con- 

 venience for collecting them. 



