Archive image from page 448 of Discovery reports (1934) Discovery reports discoveryreports08inst Year: 1934 SCYPHOMEDUSAE 385 Hope and north of South Georgia, and one haul (St. 391) is from the south-east of the Falkland Islands. The greatest number of individuals has been collected at this station (391) with twenty specimens of different sizes, and at another rich haul at St. 395 (north of South Georgia) there were six specimens. In three localities (Sts. 407, 72, 151) A. chuni has been taken together with A. ivyvillei and Periphylla hyacinthina. The distribution of Atolla chuni is wholly r
Archive image from page 448 of Discovery reports (1934) Discovery reports discoveryreports08inst Year: 1934 SCYPHOMEDUSAE 385 Hope and north of South Georgia, and one haul (St. 391) is from the south-east of the Falkland Islands. The greatest number of individuals has been collected at this station (391) with twenty specimens of different sizes, and at another rich haul at St. 395 (north of South Georgia) there were six specimens. In three localities (Sts. 407, 72, 151) A. chuni has been taken together with A. ivyvillei and Periphylla hyacinthina. The distribution of Atolla chuni is wholly restricted to the sub-Antarctic part of the Atlantic Ocean; the medusa has not yet been found in Antarctic waters south of the latitude of Cape Horn, nor to the north of 30° S. Comparing the distribution of . chimi with that of A. zvvri/lei in the same regions, we find that in both cases most individuals are gathered in the neigJibotirhood of continents or groups of islands. 5<5 O ATOLLA CHUNI VANH O PREVIOUS RECORDS Fig. 9. Chart showing the distribution of Atolla chuni, Vanhoeffen. Vertical distribution (see Table IX). A. chuni is a true deep-sea medusa with the typical pigmentation of abyssal forms. The ' Valdivia' found it in ± 1500 m. depth, and the ' Scotia' in about 2000 m. The ' Discovery' never collected A. chuni in closing net hauls from 800 m. upwards. The most superficial catch was made south-west of the Cape between 800 and 900 m. and between the Cape and Bouvet Island in 850-950 m. In all other closing net hauls the species was present only in depths of 1000-1500 m. The specimens collected with open nets were also found only when nets were used at depths exceeding 1100 m. All these facts prove to be a true component ofBigelow's so-called intermediate fauna. It prefers deeper layers than A. wyvillei. Most striking is the rich catch from St. 391 (south-east of the Falkland Islands) from 1200 to 1300 m. depth, with twenty-one fair individuals, almost t
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