MEDUSA. I. yj 



Material (see Chart III). 

 Greenland: 



1) — Lat. 7o°4i' N., Long. 52°07' W., Umanak Fjord. August 6th 1908. Depth 727 ni. Ringtrawl, 

 800 m wire. "Tjalfe" stat. 171. - i specimen, about 50 mm wide. 



2) — Ritenbenk, Disco Bay. Bergendal. — i specimen, about 68 mm wide. 



3) — LaL 69''i7' N., Long. 52°i4' W., south coast of Disco. July i6th 1908. Depth 430-440 m. 

 Ringtrawl, 550 m wire. "Tjalfe" stat. 125. — 2 specimens, 70—90 mm wide. 



4) — Jakobshavn, Disco Bay. Bergendal. — i specimen, 14 mm wide. 



5) — Lat. 66°55' N., Long. 54°37' W., 20 miles west of Holstensborg, August 23rd 1908. Depth 

 66 m. Ringtrawl, 80 m wire. "Tjalfe" stat. 211. — i specimen, about 40 mm wide. 



6) — Godthaab Fjord, Lat. 64°!!' N. August 30th 1908. Ringtrawl, 120—80 m wire. "Tjalfe" stat. 

 234. Ringtrawl, 30 m wire. "Tjalfe" stat. 235. — Some few specimens, not preserved. 



7) — Greenland, without further details. "Fylla". — i specimen, about 40 mm wide. 

 Atlantic: 



8) — Lat. 59°07' N., Long. i3°32' W. Mob erg. — 3 specimens, two of which are the type spe- 

 cimens of Ptychogrna pinnitlafa Haeckel. 



Kara Sea: 



9) — Kara Sea, without further details. "Dijmphna". — i specimen, about 35 mm wide. 

 Polar Sea: 



10) — Cape Stephens, Franz Joseph Archipelago. H. Fisher. — i specimen. 



The last-mentioned specimen have I seen in the British Museum of Natural History in London, 

 the others are all in the Zoological Museum of Copenhagen. 



Moreover the species has been recorded from the following localities: Near Jakobshavn, Green- 

 land (Vanhoffen 1897, p. 273). — Eastern and western part of the Barents Sea north of Lat 72°30' N. 

 (Linko 1905, p. 217). — Near HaHfax, LaL 42°o8' N., Long. 69°39' W. ("Challenger", Haeckel 1881, p. 6). 

 — Nahant, Massachusetts Bay (A. Agassiz 1865, p. 137). — Bering Sea, Sea of Okhotsk, and off the 

 east coast of Hokkaido, Japan (Bigelow 1913, p. 28). — Moreover Levinsen (1892, p. 3) mentions 

 this species from Iceland from the authority of Fa be r. In his "Naturgeschichte der Fische Islands" 

 (1829) Faber describes 10 species of medusce, but I am not able to see, how any of his descriptions 

 could refer to Ptychogena lactea. 



The places of occurrence off the west coast of Greenland are all near the coast in the cold 

 water. No specimen has been found in that part of the Davis Strait, which is occupied by the com- 

 paratively warm Atlantic water. 



The data now in hand give us the following general picture of the horizontal distribution of 

 this species: 



Ptychogena lactea has its home in the arctic regions, and has probably a circumpolar distribu- 

 tion. It is found off the west coast of Greenland between Lat. 64°! i' and 70°4i' N., further in the 

 Barents Sea, the Kara Sea, and near Franz Joseph Archipelago. Only occassionally it has been found 

 in the Atlantic outside the arctic region, viz. north-west of Scotland ' and in the Massachusetts Bay. 



In the Pacific it follows the Kamtschatka Current southwards as far as the northern part of Japan. 

 I If the statement of that locahtv is correct. 



