of the Fishery Board for Seotland. 235 



obtained, though sparingly, in gatherings from fifty and one hundred 

 fathoms, but probably some of the specimens may not have been obtained 

 at the depths stated, but may have entered the net when it was being 

 hauled up. 



Family Leptodorhle. 



Genus Leptodora, Lilljeborg. 



Leptodora diyalina, Lillj eborg. 



This beautiful and interesting Cladoceran was frequent in some of the 

 surface tow-net gatherings, but its extreme transparency when living 

 enables it usually to escape observation, except by those who are more or 

 less accustomed with the method of hunting for such organisms. 



It will be observed from what has been • stated in the foregoing notes 

 on the results of my examination of Loch Morar, that this loch contains 

 an abundant and interesting crustacean fauna which is well suited as a 

 food supply for its numerous finny inhabitants. In this respect Loch 

 Morar compares very favourably with Loch Ness, that somewhat resem- 

 bles Loch Morar both in size and physical conditions. A partial examina- 

 tion of Loch Ness was made on two occasions during the summer of 1890, * 

 when Entomostraca were found to be much less numerous than they were 

 in Lo m Morar in 1892. On the other hand, Loch Leven, Kinross-shire, 

 which is a comparatively shallow loch, though covering a considerable 

 area, and which was examined also in 1890, * closely resembled Loch 

 Morar in the abundance of its crustacean fauna. There was of course 

 some difference in the proportion and in the kinds of associated species, 

 but this difference is of comparatively small importance when the organisms 

 are considered from the utilitarian point of view of their value as a food 

 supply for fishes, as almost all the micro-crustacea are of equal importance 

 in this respect. Moreover, Loch Morar, like Loch Leven, is reputed to 

 be a loch where the angler is almost certain of a good and successful clay's 

 fishing; but being so much out the way and so difficult of access, 

 comparatively few anglers visit Loch Morar. 



Note on Attheyetla, Brady (see page 225). 



The following information was obtained after the preceding notes were 

 in the press : — 



G. 0. Sars, in a paper entitled ' Oversigt af de indelandske Fersk- 

 ' vands-copepoder,' published in Christiania by 1J nigger & Christie in 

 1863, described among other things three species of Canthocamptus, new 

 to science, viz., Canthocamptus crassus, Canthocamptus jpygm&us, and 

 Canthocamptus hrecipes, but without illustrative figures. 



In 1883 Professor Lilljeborg exhibited a collection of Crustacea at the 

 International Fisheries Exhibition held that year in London. This collec- 

 tion, which included the three species of Canthocamptus here referred to, 

 was secured by the Rev. A. M. Norman, F.R.P., and added to his ex- 

 tensive museum. 



Through the kindness of Dr Norman, my son, Mr Andrew Scott, was 

 recently favoured with an opportunity of examining Lilljeborg's specimens 

 of Sars' Canthocamptus, and of comparing them with the description of 



* Bee Part IIL of the Ninth Annual Rupoit of the Fishery Board for Scotland. 



