sea- fisheries laboratory. 421 



Diatoms. 



Coscinodiscus occurred in abundance in almost every 

 netting, and Biddulphia was nearly as common, but all 

 other diatoms, with the exception of Chaetoceras, were 

 absent from the coarse nettings. The latter was taken in 

 moderate profusion by the surface net only. 



Copepods. 



Acartia clausi occurred with greatest persistence, and 

 was found in all but a few shear-nettings, but it was run 

 very hard by P seudocalanus elongatus, which rarely failed 

 to appear. Several forms were nearly as common as these 

 two. Metridia lucens, Centro pages hamatus, T'emora 

 longicornis, and Calanus finmarchicus were only absent in a 

 few of the surface gatherings, but of all the Copepods, 

 only Calanus appears to swim deep enough to be caught 

 in any abundance by the shear-net. Other Copepods of 

 rarer occurrence were Anomalocera patersoni, Para- 

 calanus parvus, Oithona similis, and Candacia armata. 

 Monstrilla was taken once in the Calf Sound, in the 

 agitated water of which unusual forms such as this are 

 occasionally found. 



Other Forms. 



Ceratium (mostly tripos and intermedium) was ion ml 

 in a few gatherings; Medusoids occurred in both surface 

 and deep nets; Sagitta hipunctata was found (as usual) in 

 large numbers in the deep nets and sparsely in the surface 

 net; Tomopteris was taken twice in the surface net; 

 Podon and Evadne were present in a few surface 

 gatherings. Oihopleura is rarely absent from any 

 gathering. 



