142 Proceedings of the Royal Society of Edinburgh. [Sess. 



Loch Dernaglar, ^ mile south of the last mentioned, is somewhat 

 circular in outline, and about ^ mile across. The moor around is flat 

 and treeless, and the water is peaty. Banks of peat usually separate the 

 water from the moor, but occasionally the shore is stony, or is formed of flat 

 rock, this being particularly the case on the east side, which consequently 

 is rather bare of littoral vegetation. The western margin is marshy, 

 especially near the affluent (fig. 67), and supports a considerable vegetation, 

 associations of Scirpus lacustris, Equisetum limosum, Phragmites communis, 

 Carex rostrata, C. filiformis, and C. Goodenovii being dominant. Juncus 

 lamprocarpus and J. acutiflorus grow together in abundance. Heleocharis 

 multicaulis was common in water about a foot deep, many of its leaves 

 floating on the surface, whilst the flowering stems were erect (fig. 68); 

 viviparous forms of it were also plentiful. Pilularia globulifera was ex- 

 tremely abundant in shallow parts on the eastern side (fig. 69). The other 

 plants observed at this loch were — Littorella lacustris, Lobelia Dortmanna, 

 Subularia aquatica, Isoetes lacustris, Juncus fluitans, Myriophyllum 

 alterniflorum, Chara fragilis, var. delicatula, Castalia speciosa (fig. 67), 

 Potamogeton polygonifolius, P. natans, P. rufescens, P. lucens, Sparganium 

 natans, Menyanthes trifoliata, Heleocharis jDalustris, Juncus eflusus, Erio- 

 phorum polystachion, Ranunculus Flammula, Carex flava, var. minor, 

 Hydrocotyle vulgaris, etc. 



Whitefield Loch is 3 miles south-east of Glenluce, at an elevation of 191 

 feet above sea level. It has an angular outline, is about | mile long 

 by I mile wide, and is a good deal enclosed by trees with cultivated 

 land or moor beyond. The water, which has a maximum depth of 14 

 feet, is slightly peaty, the shores are stony, and for the greater part bare of 

 veo-etation. The most noticeable feature of the shore flora is the abundance 

 of Lythrum Salicaria. Besides a number of plants usual to the district, 

 there is nothing here of particular interest. 



Barlockhart Loch is a small circular pool, with non-peaty water, about 

 a mile south-east of Glenluce. It is surrounded, excepting on the west, by 

 low hills, the land being either pasture or arable. This loch is enclosed by 

 a zone of Phragmites communis, beyond which, in the water, there is an 

 association of Castalia speciosa and Nymphsea lutea also extending around 

 the loch ; but at the east end Equisetum limosum is interposed outside the 

 Phragmites. Behind the last mentioned there is a strip of marsh with a 

 number of the usual bog plants, as well as Salix aurita and Alnus glutinosa 

 in places (fig. 70). A curious floating form of Hydrocotyle vulgaris occurred 

 here (p. 77). Dwarf forms of Potamogeton obtusifolius in shallow water 

 (p. 84), as well as the normal form in deeper water, were abundant. 



