SCYPHOMEDUSAE 379 



wyvillei in St Mathias Bay not far from the coast of Patagonia in 42° 32' S, 57° 27' W 

 in 2040 fms. The 'Valdivia' secured a specimen south-east of Bouvet Island in 

 56° 30' S, 14° 29' E in a vertical haul from 1500 m. (821 fms.). The ' Scotia' caught 

 a specimen in 72° 02' S, 23° 40' W, vertical net, o-iooo fms. (Browne, 1908, p. 241). 



From south to north this form sinks slowly into the deeper layers. It is found from 

 the surface to 400 m. off the coast of Antarctica, it lives near Bouvet Island in 650 and 

 700 m. depth, between Bouvet Island and the Cape at 850-950 m. and at Cape Agulhas 

 and the Cape of Good Hope at ± 1000 m. (see Table VII). 



With regard to temperature it seems that forma wyvillei occurs mostly in waters of 

 2-3° C. ; the highest temperature is 4° C. near Ascension Island and the Gulf of Guinea 

 and the Cape Verde Islands, and the lowest temperature observed is at South Georgia 

 (Sts. 151 and 12) where it was found in about 1-25 to 1-5"' C. It is evident that the 

 upward movement of warm deep water in the far south affords a valid explanation of 

 the occurrence oi A. wyvillei in the upper layers in these latitudes. 



The vertical distribution of Atolla thus agrees perfectly with Browne's description 

 (1910, p. id). 



Atolla chuni, Vanhoeffen 



(Plate XIV, figs. 3, 4; Plate XV, fig. 5 ; Figs. 7-9) 



St. 85. 23.vi. 26. 33° 07' 40" S, 4° 30' 20" E, west of Cape of Good Hope. 4! m. tow-net, 

 2000 (-0) m. 



One specimen faded, nine or eleven warts on lappets, seldom united into a crista, gonads well 

 developed, yellowish. 



St. 256. 23.vi. 27. 35" 14' S, 6''49'E, west of Cape of Good Hope. Young fish trawl, 850- 

 1 100 (-0) m. 



One specimen, in fair condition, flat, very deeply pigmented, seven or nine warts on lappets, 

 furrows on disc very feeble, no gonads. 



St. 76. 5. vi. 26. 39° 50' 30" S, 36° 23' W, far north of South Georgia. 4I m. tow-net, 1500-0 m. 

 Two specimens, flat, the larger with very feeble radial furrows on margin of central disc, large 

 warts on lappets, the smaller without radial furrows, very small warts, no gonads, both very deeply 

 pigmented. 



St. 407. 12. vi. 30. 35° 13' to 34° 57' S, 17° 5oi' to 17° 48' E, south-west of Cape of Good Hope. 

 4I m. tow-net, 800-900 m. 



Four specimens, flat, feebly pigmented, only stomach and lappet zone with pigment ; together with 

 many Atolla wyvillei and Periphylla hyacinthina forma dodecabostrycha. 



St. 72. I. vi. 26. 41° 43' 20" S, 42° 20' 40" W, between Falkland Islands and Tristan d'Acunha. 

 4I m. tow-net, 2000 (-0) m. 

 One specimen, faded, gonads feebly developed, together with many Atolla wyvillei. 



St. 107. 4. xi. 26. 45° 03' S, 17° 03' E, between the Cape of Good Hope and Bouvet Island. 

 4! m. tow-net, 850-950 m. 



Three specimens ; two with irregular sculpture on central disc, seven and nine warts on lappets, 

 only stomach and lappet zone pigmented, faded, the largest the darkest, with smooth central disc, 

 with gonads. 



7-2 



