.1.44 



Part III. — Seventeenth Annual Report 



Table containing the Names of Entomostraca Captured by the 

 Tow-Nets, with Date of Capture. 



Abbreviations as before. 



Names of the Species. 



1897. 



1898. 



oept. ytn. 



JNov. zo. 



Mar. 15. 



June 27. 



COPEPODA. 











Diaptomus gracilis, G.O., Sars, 



0 



f. (fr .in fine 



f. (c. in fine 



f . (in fine 





net). 



net). 



net only). 



Cyclops strenuus, Fischer, ... 



0 



r. 



0 



0 



viridis, (J urine), 



0 



r. 



r. 



0 



,, albidus, (Jurine), 



r. 



0 



o 



0 



,, fimbriatus, Fischer, - 



0 



0 



0 



r. 



Cladocera. 











Holopedium gibberum, Zaddach, - 



c. 



c. 



0 



ab. 



Sida crystallina, Miiller, 



0 



r. 



0 





* Dapknia (?) longispina, Leydig, var. 











aquilina, 



c. 



c. 



f. 



f. 



- ' : 



Polyphemus pediculus (Linn.), 



0 



0 



0 



'• 



Bythotrephes longimanus, Leydig, - 



fr. 



0 



0 



f - 



Leptodora hyalina, Lillj. 



fr. 



0 



0 



o 



1 



It will be observed that the Daphnia was the only species which was 

 obtained in all the four gatherings. Bythotrephes was observed in the 

 September and June gatherings, but not in the others, and Leptodora 

 occurred only in the September gatherings. It may be also noted that 

 Infusoria (Ceratium, etc.) and micro-algse were much less frequent in the 

 June gatherings collected by the fine net than in those collected during 

 the other months. 



The Shore Fauna Collected by the Hand-Net. 



Forty-two species of Crustacea were obtained in the gatherings collected 

 by hand-net round the shores of Loch Arklet. They all belong to the 

 Entomostraca, and comprise fourteen species of Copepoda, seven 

 species of Ostracoda, and twenty-one species of Cladocera. A few 

 comparatively rare forms — such as Cyclops macrurus, Canthocamptus 

 inornatus, Harporhynchus falcatus, Acantholeberis curvirostris — were 

 observed in these gatherings ; but such rare forms will be more particularly 

 referred to under " Notes on the Species." The following are the names 

 of all the species of Entomostraca observed in the gatherings collected 

 round the shores of the loch. 



* Males and ephippial fema.es of this Daphnia were frequent in the November 



gathering. 



