54 DISCOVERY REPORTS 



Many of the localities are in the waters west and east of Africa, from the Cape Verde Islands round 

 the Cape of Good Hope to Somaliland, and in a line along about 32" S from South Africa almost to 

 Australia, within which regions the species was previously known to be of common occurrence. It 

 is also present in numerous localities in the South-West Atlantic, from which region there was only one 

 previous record. A few specimens were taken north and north-west of South Georgia by the Swedish 

 Antarctic Expedition (Kramp 19486, p. 9), but the present collection shows that it is generally dis- 

 tributed and very common in this area. It was taken in numerous hauls round South Georgia and 

 also over the whole area between 30° and 60° W. The southernmost locality was in the Weddell Sea 

 at St. 1876 (58° 37-7' S, 54° 54-4' W). It also occurred in several localities along 30° W between 

 latitudes 55'^ S and 30° S. 



Of particular interest are the following localities: Stns 114, 117 and 1784 in the neighbourhood of 

 Bouvet Island, St. 1633 south-east of Heard Island, St. 1728 at 53"" 14-9' S, 107° 02' E, St. 1707 at 

 63° 36-9' S, 129^ 24-7' E near the Antarctic Continent, and St. 1298 in the Pacific section of the 

 Antarctic, about 69° S, 126^ W. This is the first time this species has been recorded from the South 

 Pacific, and the only reliable previous records from the Indian Ocean sector of the Antarctic ocean 

 are those of Vanhoffen (19026) of P. riibriim from between 55° 27' S, 28^ 59' E and 6^" 14' S, 53° 30' E. 

 The map given by Thiel (1936, p. 26) is unreliable, because this author has united several different 

 species under the name P. rubrum. 



Distribution. P. haeckeli occurs in the deep and intermediate layers, and it is probably generally 

 distributed in the deeper regions of all the oceans, except the arctic basins and the Mediterranean. 

 It is common in the North Atlantic as far as the Wyville Thompson Ridge, and west of Greenland it 

 may occasionally traverse the submarine ridge and penetrate into BaflSn Bay. In the North Pacific 

 it is common from Japan to the Bering Sea and off the northern part of the west coast of America 

 between Alaska and Puget Sound, but it has not yet been recorded from the East Pacific farther south. 



Colobonema sericeum Vanhoffen 1902 



(Text-fig. 19) 



19026 Colobonema sericeum Vanhoffen, p. 57. PI. 9, fig. i ; PI. 12, figs. 39-42. 



1905 Colobonema typicum Maas, p. 53. PI. 10, figs. 62-5. 



1910 Homoeonema typicum Mayer, p. 385, in part. 



1912a Colobonema sericeutn Vanhoffen, p. 372. 



1936 Colobonema sericeum Ranson, p. 152. PI. 2, figs. 14-15. 



1953 Colobonema sericeum Russell, p. 436. PI. 25, fig. i. Text-figs. 287-289. 



Occurrence: 2. xi. 25. 6° 55' N, 15° 54' W. 28. x. 25, 13° 25' N, 18° 22' W. Stns 78, 81, 85, 86, 87, 89, 100, loi, 

 248, 256, 281, 296, 405, 407, 440, 677, 690, 700, 1569, 1575, 1600, 1602, 1604, 1741, 1743, 1747, 1750, 1751, 1753, 

 1754. 1755. 1757. 1758, 1759. 1762, 1765, 1766, 2031, 2033, 2035, 2036, 2044, 2047, 2057, 2059, 2061, 2063, 2064. 

 (For details of station positions, date, etc., see Table i, p. no, and text-fig. 19, p. 103.) 



In the Atlantic Ocean, this species was taken in numerous localities off the west coast of Africa, 

 between Cape Verde and the Cape of Good Hope, and farther west towards South America, 

 the southernmost locality was at St. 78, in 35° 18' S, 19° 01' W. It was also taken at most of the 

 stations along latitude about 32° S, from South Africa almost to Australia, and in one locality 

 (St. 1575) in the Mozambique Channel. The species was previously known from about the same 

 regions, with the exception that Stns 677 and 690, about 30° W, are somewhat farther west than any 

 other previous records from the southern Atlantic. 



Colobonema sericeum is a bathypelagic medusa, and the majority of the present collections were 

 made in the deep layers; but there are some few exceptions, of which the most remarkable are 



