of the Fishery Board for Scotland. 



161 



species of Crustacea and fourteen of Mollusca are the total number of the 

 species belonging to the two groups of organisms observed in the various 

 gatherings collected. The Crustacea comprised one Amphipod, eighteen 

 species of Copepoda, eighteen of Ostracoda, but only thirteen of Cladocera. 

 The number of Cladocera observed in the hand-net gatherings collected at 

 Forfar Loch is smaller than that observed in any of the lochs previously 

 described. 



Amongst the rare species observed in this loch mention may be made 

 of the following : — Cantlwcamptus inomatus was discovered for the first 

 time in Rescobie Loch, near Forfar, a few years ago, and it is interesting 

 to find it also in Forfar Loch. Moravia brevipes has been observed in 

 very few of the Scottish lochs. Cypris pubera and Ilyodromus violacea 

 are two Ostracods that are still considered as rare British species. 

 Leydigia quadrangidaris is a somewhat rare Cladoceran, which in Scotland 

 has only been observed in a few places. 



(6) Loch Leven. 



Loch Leven, so well known for the excellence and beauty of its trout, 

 and which is now more frequented by anglers than any other loch in 

 Scotlaud, is one of the series of lochs that have recently been examined, 



An investigation was also made of this loch in June 1890, and the results 

 were fully described in a paper published in Part TIL of the Ninth 

 Annual Report of the Fishery Board for Scotland (1891). In this paper 

 reference is made to some interesting statistics bearing on various matters 

 connected with the Loch Leven fishery, to which the attention of the reader 

 is directed. The present area of the loch, as stated in the previous paper, 

 is about 3406 acres, or 1232 acres less than it was previous to 1845. The 

 greatest length of the loch, measuring in a straight line from a point a 

 little east of the Sluices to the head of the bay called Burleigh Sands, is 

 slightly under three and three-quarter miles, while its greatest width 

 appears to be nearly two and a quarter miles. It somewhat resembles a 

 triangle in general outline, the eastern extremity, where the River Leven 

 that drains the loch takes its rise, being the apex, and the end next 

 Kinross the base. The height of Loch Leven above the sea is about three 

 hundred and fifty-three feet; it is comparatively a shallow loch, but in the 

 vicinity of St. Serf's Island — off the south and south-west shores — depths of 

 seventy and eighty feet are met with. It is also moderately deep a little 

 to the north and north-east of Scart Island. A considerable portion of 

 the bottom of Loch Leven, especially towards the north side, is composed 

 of sand, but in the deeper parts the bottom is muddy. At the west end 

 of the loch the American weed, Elodea canadensis, is causing a great 

 amount of trouble by its rapid and persistent growth. All the means 

 hitherto tried for the purpose of destroying the weed are found to be only 

 of temporary benefit, and it is very disheartening to those interested in 

 the prosperity of the loch to find that in order to keep it clear of the 

 weed the same laborious work has to be done over and over again. 



I must express my great indebtedness to Mr. White, the manager of 

 the Loch Leven Fishery, for the kiudly and ungrudging way in which he 

 placed a boat at my service on all the four occasions when I visited the 

 loch. 



Temperature and other Physical Observations. 



Loch Leven was visited in September and December 1897, and in 

 March and June 1898, and the following Table contains the temperatures 

 recorded for these dates. 



