54 



MEDUSA. I. 



fact in such younger specimens we usually find ever}- possible transitional stage of development be- 

 tween the smallest and the fully developed tentacles. 



Material (see Chart V): 

 North-East Iceland: 



i) — Lat. 66°io' N., Long. i^°2g' W., near Langenses. August i3tli 1904. Surface. "Thor" stat. 

 253 (04). — Specimens in the collection of the Plankton Laborator)-, Copenhagen. 



Chart V. Occurrence of Mcltci-rtum octocostatum M. Sars. O Occurrence according to the hterature. 

 In the hatched regions the species is conimotily occurring. 



2) — Lat. 66°i7' N., Long. i4°27' W., near Langentes. July 20th 1904. Depth 77 m. Young-fish 

 trawl, 80 m wire. "Thor" stat. 203 (04). — i specimen, height 6 mm, diameter 7 mm. 



3) — Lat. 66°25' N., Long. i4°5i' W., near Langenses. August 14th 1904. 70 m wire. "Thor" stat. 

 257 (04). — Specimens in the collection of the Plankton Laboratory, Copenhagen. 



41 — Lat. 66°46.5' N., Long. I4°57' W. August 20th 1904. Depth 102 m. "Beskytteren", Genizoe. 

 — I specimen, height 11 mm, the apical jelly 3 mm. 



