6o 



MEDUSA. I. 



describes the i6 "diadems", each containing 30 "pearly nodules"; he further mentions the high illumi- 

 nating power of the animal. The description is, however, rather short and not very exhaustive. 



In 1903 Browne described a species, Mitrocoinclla fuiva from Bergen and Plymouth, but in 

 1905 he states that it is identical with polydiadeiiiafa^ of which species he gives, at the same time, a 

 new and more thorough description based on specimens from the Firth of Clyde (1905, p. 767). 



Chart VI. I'liids of Mitrucoma polydiademata (Roniantsl. O Occurrence according to the Hteratnre. 



Material (see Chart VI): 



1) — Off Trangisvaag, Faeroe Islands. May 14th 1904. Young-fish trawl at the .surface. "Thor" 

 Stat. 80 (04). — I specimen, about 13 mm wide. In the collection of the Plankton Laboratory, Copenhagen. 



2) — I.at. 59°54' N., Long. 4°34' E., near the coast of Norway south of Bergen. May 8th 1905. 

 Young-fish trawl, 65 m wire. "Thor" stat. 24 (05). — i specimen, about 22 mm wide. 



3) — Lat. 56°o8' N., Long. o°i5' W., about 90 miles off the mouth of Firth of Forth. iMay 4th 

 1905. Young-fish trawl, 80 m wire. "Thor" stat. 16 (05). — 4 specimens, 10—14 mi" wide. In the collection 

 of the Plankton Laboratory, Copenhagen. 



