376 



DISCOVERY REPORTS 



between the southern part of America and Africa, between 30 and 60° S. A few speci- 

 mens have previously been recorded from the same regions by the Challenger Expedition 

 (far north of the Falkland Islands) , the Plankton and Valdivia Expeditions (in the Guinea 

 Stream), by the latter also between the mouth of the Congo and the Cape of Good Hope, 

 and south of Bouvet Island, by the Deutsche Siidpolar (Gauss) Expedition between 

 Tristan d'Acunha and the Cape of Good Hope and Cape Verde, and by the ' Scotia' 

 near Coats Land. What the 'Michael Sars' has done in the North Atlantic, the 'Dis- 

 covery' has done in the south. No other expedition brought home such a number of 

 Atolla from these regions. In correspondence with the results of the 'Michael Sars' 



Fig. 6. Chart showing the distribution of Atolla luyvillei, Haeckel, in the 

 South Atlantic and Southern oceans. 



only Atolla forma hairdi and verrilli have been taken in the neighbourhood of Cape 

 Verde from a depth of 800-200 m. Atolla wyvillei typica, which previously has been 

 recorded as the only species in Antarctic waters, has been found by the ' Discovery' in 

 the same regions (south of South Shetlands, Bellingshausen Sea, South Georgia, 

 Bouvet Island). 



Between the tropical region on the one side and the Antarctic on the other, we find 

 a large region in which all three kinds are found near each other. In several hauls 

 specimens of all three forms were found together. A glance at Fig. 6 shows also that the 

 material is not distributed equally along the route. There seem to exist several centres 

 of distribution : south of Cape Verde, north of South Georgia, the waters near the Cape 



