54 



MEDUSAE. I. 



fact, in such younger specimens we usually find every possible transitional stage of development be- 

 tween the smallest and the fully developed tentacles. 



Material (see Chart V): 

 North-East Iceland: 



i) - - Lat, 66io' N., Long. i429' W., near Langenses. August 13111 1904. Surface. "Thor" stat. 

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



ZOO Meter 



600 



1000-,-- 



iooo-\- 

 3000 - \- 



Chart V. Occurrence of Melicertum octocostatum M. Sars. O Occurrence according to the literature. 

 In the hatched regions the species is commonly occurring. 



2) -- LaL 66i7' N., Long. i427' W., near Langenaes. July aoth 1904. Depth 77 m. Young-fish 

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



3) - - Lat. 6625' N -> Long. i45i' W., near Langenaes. August i4th 1904. 70 m wire. "Thor" stat. 

 257 (4)- - Specimens in the collection of the Plankton Laboratory, Copenhagen. 



4) -- LaL 6646.5' N., Long. i457' W. August aoth 1904. Depth 102111. "Beskytteren", Gemzoe. 

 - i specimen, height n mm, the apical jelly 3 mm. 



