LEPTOMEDUSAE 31 



The occurrence of this North Atlantic medusa near the Falkland Islands is most astonishing. The 



specimen is, however, typical in every respect, and it is impossible to point out any structure which 



might justify the erection of a new species distinct from H. ocellata. It is 31 mm. in diameter and 



has 12 radial canals in four groups of three each. Parts of the umbrella margin are mutilated, but 



from countings in well-preserved portions the number of tentacles may be estimated at about 100, 



the number of marginal vesicles as between 70 and 80 ; there is one cirrus between each successive 



pair of tentacles. Thus also in numerical respects this specimen agrees with the North Atlantic form. 



Distribution. East coast of North America, north of Cape Cod; west coast of Greenland as far 



north as Disko Bay; southern and western coasts of Iceland; west of the British Isles; the Faeroes; 



west coast of Norway from Bergen to Tromso. In the North Atlantic area this species accordingly 



may be designated as northern-boreal. The present find in anti-boreal waters shows that it has 



a bipolar distribution. 



Cosmetirella davisi (Browne 1902) 



(Text-fig. 6) 

 1902 Tiaropsis davisi Browne, p. 281. 



1910 Cosmetirella simplex Browne, p. 34. PI. i, figs. 6-8. 



191 1 Phialella falklandica Vanhoffen, p. 223. Pi. 22, fig. 10. 

 1912a Cosmetirella kerguelensis + simplex Vanhoff'en, p. 368. 

 1920 Cosmetirella simplex VanhoflFen, p. 16. 



1932 Cosmetirella davisi Kramp, p. 359. Text-figs. 4, 34, 46. 

 19386 Cosmetirella davisi Thiel, p. 327. 



1939 Cosmetirella davisi Browne & Kramp, p. 293. PI. 17, fig. i. 

 1949 Cosmetirella davisi Kramp, p. 3. 



Occurrence: Stns 29, 30, 41B, 102, 308, 309, 314, 315, 316, 317, 326, 328, 339, 347, 348, 349, 350, 356, 592, 1719. 

 St. WS 832. Stns MS I, 2, 7, 9, II, 19, 20, 22, 23, 26, 32, 62, 65. (For details, see Table i.) 



All these localities are in the neighbourhood of South Georgia, with the exception of the following: 



St. 102. 28. X. 26. 35' 29' 20" S, 18° 33' 40" E. South of Cape of Good Hope. Net: N 100 H 52 m. 



I specimen. 

 St. 592. 15. i. 31. 64° 17' S, 75° 31' W. West of Graham Land. Net: N 100 B 124-0 m. i specimen. 

 St. 1719. 25. iii. 36. 64° 15-5' S, 104° 03-4' E. Off Knox Land, Antarctica. Net: N 100 B 128-0 m. i specimen. 

 St. WS 832. I. ii. 32. 50° 49' S, 67° 55' W. Near the coast of southern Patagonia. Net: N 100 B 75-0 m. 



I specimen. 



Altogether about 100 specimens of this species were preserved. 



As previously pointed out by me (Kramp 1932), the number of tentacles is very variable in this 

 species. Countings of the tentacles in the present collection have given the following results : 



Almost all the specimens were collected between January and April, a single one in November, and 

 some fragments in May. Within each of these months the specimens had the following diameters: 



Month Nov. Jan. Feb. Mar. April 



Diam. (mm.) 16 11-35 ^-39 "-60 11-20 



The specimen taken south of the Cape of Good Hope (St. 102) was 35 mm. in diameter. 



Distribution. Antarctic and subantarctic, circumpolar (see map of distribution in Kramp 1949). 

 The present record from near the coast of South Africa is not quite isolated, since the species was 

 recorded by Vanhoffen (1920) from a locality off the coast of South-West Africa. 



