of the Fishery Board for Scotland. 



253 



DIVISION II. 



Account of the Examination of some of the Lochs of Shetland. 

 By Thomas Scott and Robert Duthie. 



The present is our fourth contribution towards the elucidation of the 

 fresh-water fauna of the Shetland Islands. Twelve of the lochs of Shet- 

 land are described in the present paper, and are referred to in the follow- 

 ing order : — (1) The district of Lerwick, one of the lochs is described ; 

 (2) Xorthmavine, six of the lochs are described ; (3) the island of Bressay, 

 one loch is described ; (4) island of Yell, two of the lochs are described ; 

 and (5) Helliers Water, in the island of Unst, is described. 



The first portion of the paper contains a series of notes on the physical 

 aspects of each of the lochs examined, and on any other point of general 

 interest ; the second portion comprises a series of faunistic notes, describ- 

 ing briefly the results of the examination of each of the gatherings 

 collected and arranged as in the first portion. Special reference is also 

 made to any particularly rare or interesting species. 



THE FRESH-WATER LOCHS OF SHETLAND. 

 Notes on their Physical Aspects. 



(1) Lerwick District. 



Loch of Kbbister, Gremista, Lerwick. 



(Examined April Uth 1897.) 



This loch lies about a mile north from the farm-house of Gremista, near 

 Lerwick. It was examined about 4 p.m., the day being bright, but the 

 weather only beginning to improve after a very severe winter and spring. 

 The loch lies some 200 feet above the level of the sea near the top of the 

 hill of Gremista. The surrounding ground is deep moss, but the loch has 

 a beach of fine gravel extending along the greater part of its shores, and 

 the water is very clear and transparent. Fauna did not appear to be 

 numerous, but were fairly well distributed round the margin. Had the 

 loch been visited in summer, the gathering would no doubt have been 

 larger. 



(2) Lochs in Northmavinb. 



Having no opportunity of examining the lochs in this part of Shetland, 

 as our visits w^ere few and hurried, the work had to be done by deputy. 

 Messrs. Burgess and Stove, two Lerwick gentlemen who w^ere at North 

 Roe on holiday, made the collections for us ; and to them we are also 

 indebted for a description of the lochs and their surroundings. 



Loch of Flugarth, North Roe. 



(Examined April 22nd 1897.) 



This loch lies low, having crofts all along the S.E. side, the watershed 

 being the hills on the S. W. A burn from the north end of the " Buirgs " 

 enters its S.W. side, and another burn at its north end connects it with 



