Chaetognaths 



By 



Rudolf von Ritter-Zahony. 



The Sagitta material of the Ingolf Expedition, which Director G. M. R. Levinsen kindly transmitted 

 to me for investigation, comes from the North Atlantic Ocean between Greenland and Norway 

 and from the Davis Strait. It consists of vertical and surface hauls. Of the former I give a summary 

 at the end of this paper; the results of the latter are only referred to in the text. Along with the 

 "Ingolf" material I have also examined a larger collection of Chaetognaths, well-preserved in formaline, 

 which was made on the crnises of the "Thor" in the North Atlantic during the years 1904 — 1907. The 

 second list at the end of the paper gives the details of this collection. 



In view of the thorough investigations, which have been made within recent years into the 

 classification and distribution of the Chaetognaths, the material handed over to me could not be ex- 

 pected to contain any great novelty and, as a matter of fact, only known forms occurred, the horizontal 

 and vertical distribution of which had already been elucidated. Only some few places are new for the 

 species obtained, but they do not alter the picture of their distribution which earlier observations 

 had given. 



In the following I mention the species taken as also their occurrence in the hauls of the "Ingolf 

 and the "Thor", restricting myself otherwise to some few faunistic remarks. I can do this the more 

 readily, since the systematic and faunistic characterization of the Chaetognath species has but recently 

 been brought up to date in the "Tierreich" (29. Ljeferung 191 1), to which as also for the literature 

 reference may be made. 



Sagitta setosa J. Mull. 



This epiplanktouic-neritic species, which has hitherto only been observed in the Channel and 

 in the region of the North Sea, was frequently represented in the surface hauls of the "Ingolf" from 

 the Skagerrak and the North Sea; in addition also from one station west of the Orkney Isles. This 



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