336 DISCOVERY REPORTS 



and ' Gauss' record many, or more than loo specimens. These small numbers may be 

 due firstly to the small numbers of stations, secondly to a certain scarceness of animal 

 life in general in these regions, and thirdly to the predominance of surface collections, 

 large Scyphomedusae being relatively rare in superficial layers far from the coast. 



I restrict myself here to mentioning only the collections of expeditions to the South 

 Atlantic and the Atlantic quadrant of the Antarctic Ocean, as Maas (1906) and Browne 

 (19 10) have given a complete list of Scyphomedusae recorded from the whole Antarctic 

 region, and Vanhoeffen (1909) has published a chart of their geographical distribution. 

 Few additional specimens have been obtained from the Indian Ocean and Pacific 

 sectors, and the lists and charts hardly need any alteration. 



From the above records it is evident that the Antarctic and sub-Antarctic parts of the 

 South Atlantic 1 are extremely poorly explored, and that these regions have become better 

 known with regard to Scyphomedusae by the results of the ' Discovery ', our knowledge 

 of the geographical distribution of some forms especially having become much enlarged. 

 The ' Discovery ', the ' Discovery II ' and the ' William Scoresby ' collected the following 



material : 



Charybdeidea. 



Tamoya haplonema, F. Miiller. 6 specimens. 



CORONATAE. 



Periphylla hyacintliina, Steenstrup. 103 specimens. 

 Naiisttlioe punctata, Kolliker. 5 specimens. 

 Atolla wyvillei, Haeckel. 185 specimens. 

 Atolla chuni, Vanhoeffen. 43 specimens. 



Semaeostomeae. 

 Pelagia noctiluca, Forskal. 26 specimens. 

 Chrysaora fulgida, Reynaud. 3 specimens. 

 Desmotiema gaudic}iaiidi,hesson. i specimen. 

 Desmonema chierchiana, Vanhoeffen. i specimen. 

 Phacellophora ornata (Verrill). i specimen. 

 374 specimens in all. 



The number of species is not large (10); they belong to eight different genera and 

 there are 374 specimens in all. All these species are holoplanktonic and not a single 

 specimen of the neritic Lucernaridae (Stauromedusae) has been collected. This is the 

 more striking, because in the waters round South Georgia many hauls were made. 

 There was during the cruise of the ' Discovery ' a biological station established at South 

 Georgia, and previously Haliclystus antarcticiis, Pfeff"er, was collected there by van der 

 Steinen.^ The absence of littoral species in the present material is no doubt due to the 



1 In order to avoid misunderstanding regarding the position of the northern boundary line of the Antarctic 

 Ocean, I consider, following Browne (1910, p. 324), that the Falkland Islands (± 52° S) lie outside the 

 boundary line of Antarctic waters. 



- See Pfeffer, G., 1889, Zur Fauna von Siid Georgien, Mitt. Naturhist. Mus. Hamburg, Jahrg. 6; Thiel, 

 Max E., 1928, Die Scyphomedusen des Zoologischen Staatsinstituts und Zoologischen Museums in 

 Hamburg. I, Cubomedusae, Stauromedusae und Coronatae, Mitt. Zool. Staatsimt. iind Zool. Mus. Hamburg, 

 Bd. XLiii. 



