30 DISCOVERY REPORTS 



State (Kramp 1919) that the same arrangement was frequently found in the northern form, and now 



that a large collection of the southern form has become available, I can confirm that in this respect 



both forms are subject to the same variations. S. falklandica has never been observed again since it 



was described by Browne until now, and in the literature it has usually been mentioned as a doubtful 



synonym of S. mertensi. The Discovery collection has enabled me to compare the two forms side by 



side, and I have found that they agree in every respect. Unfortunately, very few of the southern 



specimens are in such a condition that the tentacles can be counted ; in four specimens the numbers 



are as follows : 



Diam. (mm.) 34 54 64 115 



Approx. no. of tentacles 300 400 700 1400 



In this respect also, the Falkland specimens agree with the North Atlantic form. 



Staiirophora mertensi is thus the only existing species of the genus. 



Distribution. Arctic-boreal, circumpolar. In the North Pacific it occurs as far south as Akkeshi 

 Bay in northern Japan and Sitka on the south coast of Alaska. In the North Atlantic area it is common 

 from West Greenland to Cape Cod and is occasionally found at Woods Hole. In the eastern part 

 of the North Atlantic it is common round Iceland and along the northern part of the west coast of 

 Norway, occasionally, but not regularly, occurring in the North Sea. Its occurrence in the surround- 

 ings of the Falkland Islands and the South Orkney Islands shows that it is a bipolar species. 



Family Mitrocomidae 



Mitrocomella frigida (Browne 1910) 



1910 Cosmetira frigida Browne, p. 35. 



1912a Cosmetira frigida VanhofFen, p. 367. Text-fig. 3. 



1932 Mitrocomella frigida Kramp, p. 345. PI. 10, figs. 5-6. Text-figs. 23. 



Occurrence: St. 256. 23. vi. 27. 35° 14' S, 6° 49' E. West of Cape of Good Hope. Net: TYF 850-1 loo(-o) m. 



I specimen. Stns MS 23, MS 26, MS 34, 12. iv, 14. iv and 2. v. 1925. East Cumberland Bay, South Georgia. 



I or 2 specimens on each occasion. 



All the specimens are in a poor condition. The description given by me (1932) was based on Browne's 

 original specimens, in the British Museum (Nat. Hist.), London. The number of statocysts then 

 remained uncertain, and in the present specimens from South Georgia their number cannot be 

 counted; but in some other specimens from South Georgia, collected by the Swedish Antarctic 

 Expedition (Kramp 1948^, p. 4), I was able to state that the number is eight. The specimen from 

 St. 256 also has eight statocysts. 



Distribution. McMurdo Bay, Victoria Land (Browne); Gauss Station (VanhoflFen); South 

 Georgia (Kramp 19486 and the present collection). It is interesting that this antarctic species was 

 also taken at a considerable distance west of the Cape of Good Hope, evidently under the cooling 

 influence of the Benguela Current. The specimen was probably taken in the upper layers (as the net 

 failed to close) where the temperature of the water is given as 17-2^^ C. 



Halopsis ocellata A. Agassiz 1865 



1865 Halopsis ocellata A. Agassiz, p. 99. Figs. 143-7. 



1919 Halopsis ocellata Kramp, p. 65. PI. 4, figs. 1-5. Text-figs. 6-9. 



1932 Halopsis ocellata Kramp, p. 353. Figs. 6, 12, 19, 28, 32, 43. 



1953 Halopsis ocellata Russell, p. 273. PI. 14, fig. 4. Text-figs. 162-6. 



Occurrence: St. WS 851. ii.ii. 32. 5i°39'S, 62° 02' 30" W. to 5i°4i'S, 62° 00' W. West of the Falkland 

 Islands. Net: N4-T, 221-198 m. i specimen. 



