of the Fishery Board for Scotland. 



319 



gathering from Loch Greenan collected during the visit referred to, 

 twenty-two species of Crustacea were obtained, and nineteen species in 

 the gathering from Loch Pad. Two of the species from Loch Fad are 

 new to Britain — viz., Canthocamptus cuspidatus, Schmeil, and Moravia 

 Poppei (Mrazek). 



(6) Loch Rescobie, and (7) Loch Balgavie, near Forfar. 



The overflow water from Loch Rescobie runs into Loch Balgavie, and 

 this probably may account, partly at least, for the similarity of the fauna 

 of the two lochs. The gatherings collected in these two lochs were found 

 to be exceedingly rich, both in the number and variety of the organisms 

 captured; over fifty species of Crustacea were obtained in the two lochs, 

 besides fourteen species of Mollusca. The number of species of Crus- 

 tacea observed in each of the two lochs is practically the same. Thus : — 



Rescobie. Balgavie. 

 Amphipoda, .... 1 1 

 Copepoda, .... 15 12 

 Ostracoda, .... 12 13 

 Cladocera, .... 16 17 



Total, 44 43 



The difference in the number of Mollusca was very marked, eleven 

 species having been obtained in Loch Rescobie but only three in Loch 

 Balgavie : this difference, however, may be merely accidental. Cyclops 

 varicans, G. 0. Sars, one of the species of Copepoda found in these lochs, is 

 new to Britain, while Canthocamptus inornatus is new to science ; leeches, 

 water-mites, hydra, 1 water-boatmen,' Infusoria, and Diatomacea of various 

 kinds, were also more or less common. Mention may also be made of 

 Darwinula Stevensoni — a rare Ostracod — which was obtained in both lochs. 



(8) Linlithgow Loch, in the neighbourhood of Linlithgow. 



Twenty-five species of Crustacea were obtained in this loch. Cantho- 

 camptus inornatus, the species already referred to as new to science and 

 first discovered in the two lochs just described, was also found in Linlith- 

 gow Loch, where it appeared to be more frequent than in the Forfarshire 

 lochs. This was the only loch among those examined during the past 

 year where Cypris reticulata was obtained. 



Loch Frissa, Island of Mull. 



Though the number of species observed in the tow-net gathering from 

 this loch was small, the occurrence in it of Diaptomus Wierzejskei is, as 

 already indicated, of considerable interest as regards the distribution of 

 the species. 



The following table contains the names of all the species of Mollusca 

 and Crustacea that have been observed and identified ; it also shows the 

 distribution of the species in the various lochs referred to. The total 

 number of species recorded in the table is ninety-three — fifteen of which 

 are Mollusca, and seventy-eight Crustacea. The Crustacea include two 

 species of Amphipoda, twenty-five species of Copepoda, twenty-one species 

 of Ostracoda, and thirty species of Cladocera. It will be understood that 

 only those species obtained in connection with the present investigation 

 are recorded here. 



