62 TRAXSACTIONSj NATURAL HISTORY SOCIETY OF GLASGOW. 



A List of the Algae of Lamlash Bay, Arran, collected 



during" September, 1894. 



By David Robertson, LL.D., F.L.S., F.G.S. 



[A Posthumous Paper, communicated by Mrs. Robertson, and read 30th 



March, 1897.] 



Lamlash Bay is about three miles long in a line from Clauchlands 

 Point to King's Cross Point, intersecting a small portion of the 

 Holy Isle. The widest part is from a little south of the village to 

 the nearest point of the Holy Isle. The bay narrows at the north 

 channel to a little more than three-quarters of a mile in a line 

 between Clauchlands Point and the Holy Isle, and the souths 

 channel to about one-third of a mile between King's Cross Point 

 and the Lighthouse. The greatest depth is twenty-four fathoms 

 a little northward of St. Molios's Cave, and the bay is deeper on 

 an averao^e towards the south channel than towards the north. 



The appearance of the shores of Lamlash Bay does not present 

 much inducement to the marine botanist. They are mostly bare, 

 or with boulders covered here and there with coarse Algoe. Few 

 seaweeds are washed up on the beach, promising little of what 

 may be had off-shore. The tide pools along the shore are mostly 

 flat, and do not yield much along to Claughland Point. Pound 

 the point, towards Brodick, the pools are deeper and more 

 sheltered from the sun, and yield a fair variety of the less common 

 species. It may be worth while spending a little time among the 

 pools on Hamilton Pock, where Codium tomentosum^ Stackh., was 

 met with in fine condition. 



The water for some little distance off the shore, from the village 

 along to near Claughland Point, is shallow and sandy. At many 

 places a little beyond low-water large beds of Zostera are laid bare 

 or brought into view at the surface, and they generally yield a 

 variety of parasitic species, as well as others which seem to nestle 

 among the roots of this jjlant. Our best resuUs with the dredge 



