oj the Fishery Board for Scotland. 



175 



I found Mollusca rather scarce in Loch Doon ; Coleoptera were also 

 scarce ; but Corixa appeared to be locally frequent. 



It is not pretended that the various lists contained in the preceding 

 pages represent all the species of Crustacea likely to be found in the 

 various lochs described — more especially around their shores ; it is more 

 likely that further research will add considerably to the number of those 

 recorded. All that may be said about these lists in the meantime is that 

 they contain a record of the species observed by the writer in the gather- 

 ings collected in the various lochs that have been made the subject of 

 this special investigation. 



II. SECOND SERIES OF LOCHS EXAMINED. 



The second series of lochs to be noticed here comprise Loch Ness, Loch 

 Oich, and Loch Lochy, all of them situated in the Great Glen and in the 

 line of the Caledonian Canal. Tow-net gatherings have at various times 

 been collected in each of these lochs, when the s.s. Garland was on her 

 way from the East to the West Coasts or vice versa. Observations on the 

 temperature of the water, both at the surface and at different depths 

 from surface to bottom, have also been made. The number of observa- 

 tions and experiments made in these lochs is therefore very considerable. 

 Only those of them, however, that coincide more or less approximately 

 with the investigations carried out in the first series of lochs will be 

 referred to here. The examination of these three lochs has been carried 

 out under the supervision of Mr. F. G. Pearcey, to whom I am indebted 

 for most of the gatherings of Entomostraca to be described, and for the 

 records of temperature. 



(1) Loch Ness. 



This, which is the largest and deepest of the three lochs now under 

 consideration, has been examined at three different places, viz., off Castle 

 Urquhart, off Foyers, and off Port Clair, and the tow-net gatherings that 

 are to be described were collected in August, October, and December 1897, 

 and in January, August, and October 1898; they were collected at the 

 surface and at various depths down to sixty fathoms. Usually the 

 gatherings that were collected at the same place and on the same date 

 contained the same kinds of organisms, and only differed more or less in the 

 quantity collected ; it is not necessary, therefore, to describe in detail the 

 results of each separate gathering. I propose rather to give a general 

 description of the gatherings collected on the different dates at the three 

 places mentioned; referring where necessary to any point of interest that 

 presents itself concerning any of the gatherings collected or of the 

 species observed. 



Temperature and other Physical Observations. 



The following Table contains the temperature and other observations 

 that correspond more or less closely with the dates on which the tow-net 

 gatherings were collected. Only the temperature at the surface and 

 at five and ten fathoms is given, and for the following dates — 7th 

 August, 28th October, and 6th December 1897, and 3rd August and 

 7th October 1898. 



