38o DISCOVERY REPORTS 



St. 668. 19. iv. 31. 46° 42I-' S, 30^ 32' W to 46° 43 1' S, 30° 22' W, north of South Georgia. 4-i m. 

 tow-net. 1 500- 1 000 m. 

 One specimen, very beautiful, warts feebly developed, flat, very deeply pigmented, gonads (S) 

 strongly folded, well developed, covered with reddish brown pigment. 



St. 395. 13. V. 30. 48° 26f' S, 22° 10' W to 48° 261' s, 22° 06I' W, north-east of South Georgia. 

 4I m. tow-net, 1 500-1 600 m. 

 Six specimens: three small developmental stages of 10 mm., deformed, only stomach and tentacle 

 muscle pigmented; three larger specimens, one of 45 mm. diam., 18 mm. high, others flat, very dark, 

 with gonads. 

 St. 151. 16. i. 27. 53° 25' S, 35° 15' W, north of South Georgia. 4I- m. tow-net, 1025-1075 m. 



Three specimens, very deeply pigmented, two flat ones, one high, gonads feebly developed, 

 7-9 warts on lappets. 



St. 391. iS. iv. 30. 55° 48I' S, 52° 35' W, south-east of Falkland Islands. 4^ m. tow-net, 1200- 

 1300 (-0) m. 

 One specimen, flat, warts very small, very deeply pigmented, no gonads. 

 St. 391. 18. iv. 30. 55° 48I' S, 52° 35' W, south-east of Falkland Islands. 4J m. tow-net, 1200- 

 1300 (-0) m. 

 Twenty specimens, in fair condition, some with fine polygonal furrows on central disc, notches 

 often deep, warts on lappets 7,9,11, often flat, forming a crista. Most larger specimens with strongly 

 developed folded gonads forming a continuous ring. In the smaller ones the gonads are separated 

 in a varying degree from one another. 



Of this species only very few specimens are known. The Valdivia Expedition 

 (Vanhoeffen, 1903, p. 12) caught two beautiful individuals at St. 120 between the Cape 

 of Good Hope and Bouvet Island in 42° 18' S, 14° i' E in a vertical haul at 1500 m. 

 (821 fms.) ; the ' Scotia ' (Browne, 1909, pp. 240-1) took one damaged specimen between 

 South Georgia and Bouvet Island at St. 450, 48° S, 9° 50' W in 1332 fms. Vanhoeffen 

 (1903) gives two large coloured figures (general shape) of this species in pi. i, figs, i and 2, 

 and a small one representing the lappets with the warts in pi. v, fig. 26. He gives no 

 description and confines himself to mentioning a few characteristics : the highly vaulted 

 bell, twenty-three radial furrows on the central disc, twenty-four pedalia and last but not 

 least the lappets adorned with warts or small papilla-like protuberances. Mayer (1910, 

 p. 562) mentions as a character an annular ridge hidden within the ring furrow, but this 

 ridge is not to be seen in Vanhoefi'en's figures, and it is not mentioned in his description. 

 In the Discovery material no less than forty-three specimens are present, on most 

 of which the warts (' ' glass beads ") on the lappets are distinctly visible . In some develop- 

 mental stages of about 10 mm. diameter and in a few large specimens the warts are very 

 feebly developed. There is a remarkable constancy in respect of the number of tentacles 

 (24), pedalia (23) and radial furrows (23) on the central disc. 



Size of the bell (Plate XIV, figs. 3, 4 ; Plate XV, fig. 5). The diameter of the largest 

 specimen with mature gonads is 65 mm. The specimens caught by the 'Valdivia' had 

 a diameter of 27 and 50 mm. and those taken by the ' Scotia ' may have had a diameter 

 of about 50 mm. Atolla chuni does not attain the size of ^. ivyvillei, but is considerably 

 smaller. 



