140 BATHYMETRICAL SURVEY OF 



includes animals and plants of a great many different classes, but the flora 

 and fauna of tins region resemble those of any highland lochs which we 

 have studied, and there is little calling for remark. A new species of 

 rotifer, Philodina hamata, Murray, a parasite on Gammarus (the fresh-water 

 shrimp), was found here. 



" The mud of the bottom proved to resemble that of Loch Ness, and other 

 highland lochs in the comparative paucity of life. A few worms, Crustacea, 

 and molluscs are the commonest inhabitants of this region. The depth 

 of St. Mary's being moderate, some species were found which are absent 

 from the deeper muds of Loch Ness. Water-mites (Hydrachnida) of 

 several species were found, and a single small stickleback." 



