of the Fishery Board for Scotland. 177 



Table containing the Names of Entomostraca observed in Tow- 

 net Gatherings prom Loch Ness. 



Names of the Species. 



Dates. 



1897. 



1898. 



Aug. 6. 



Oct 28. 



Dec. 

 6, 7. 



Jan. 25. 



Aug. 3. 



Oct. 7. 



Copepoda. 















Diaptomus gracilis, G. 0. Sars, 





fr. 



fr. 



f. 



ab. 



ab. 



,, hircus, Brady, - 



n 



f 





f t 



ab. 



ab. 



Cyclops strenuus, Fischer, - 



o 







f. 



f. 



fr. 



,, viridis (Jurine), - 



0 



0 



r. 



0 



0 



0 



Cladocera. 















Sida crystallitia (Muller), - 



r. 



0 



0 



0 



0 



0 



Diaphauosoma brachyurum (Lievin), - 



0 



0 



0 



0 



r. 



0 



Daphnia galeata, G. 0. Sars, 



f. 



fr. 



fr. 



c. 



c. 



c* 



Bosmina long ('spina, Leydig, 



c. 



f. 



f. 



f. 



ab. 



fr. 



Alonopsis elongata, G. 0. Sars, - 



0 



r. 



r. 



0 



0 



0 



Polyphemus pediculus (Linn.), - 



f. 



0 



0 



0 



fr. 



r. 



Bythotrephes longinianus, Leydig, - 



f. 





0 



0 



c. 



fr. 



Leptodora hyalina, Lilljeborg, - 



r. 



r. 





0 



c. 



fr. 



* A few males were observed in a gathering from 60 fathoms off Castle Urquha 

 and from 50 fathoms off Port Clair. 



Diaptomus gracilis occurred in gatherings collected at the surface and 

 at various depths down to 110 fathoms, or, in other words, as deep as the 

 tow-nets were worked. 



Diaptomus hircus, Brady, did not appear to be so generally distributed 

 as the last ; it was usually more frequent in the mid- water gatherings 

 than in those collected at the surface or in very deep water. In the 

 series of gatherings collected on 3rd August 1898, no specimens were 

 observed in those from the surface down to 10 fathoms, but the 

 species was abundant in a gathering from 30 fathoms, and rare ; jd one 

 from 60 fathoms. 



Cyclops strenuus, though generally distributed, was seldom very 

 common. Cyclops viridis. — This Copepod was observed in only one of 

 the gatherings, collected in about 10 fathoms at the north-east end of the 

 loch. Among the Cladocera, the first two species in the list only occurred 

 once — the Sida in a surface gathering collected on 6th August 1897, and 

 the Diaphanosoma in a gathering from 20 fathoms collected off Port Clair 

 on August 3rd, 1898. 



Daphnia galeata was more or less generally distributed from the surface 

 down to 110 fathoms, but it was usually more common in gatherings from 

 the surface down to about 20 fathoms than in those from deep water. It 

 also seemed to be more common in the gatherings collected in 1898 than 

 in those collected in 1897. 



