ANTHOMEDUSAE 7 



Distribution. This is evidently an antarctic species. Most of the specimens were taken in deep 



water south of the Antarctic Convergence, but one specimen was found farther north (St. 78) at a 



depth of less than 1000 m. in the antarctic intermediate water, which flows northwards below the 



warmer subantarctic water. 



Ectopleura sacculifera sp.n. 

 (PI II, figs. 1-3) 



Occurrence: St. WS 720. i. viii. 31. 02° 52' 18" S, 82° 19' 30" W. Off the Pacific coast of Ecuador. Net: N 50 V, 

 loo-o m. I specimen, the holotype. 



Description. Umbrella 3 mm. high, slightly conical, diameter in basal part 1-75 mm., jelly thick 

 throughout the length of the umbrella. Exumbrella with eight nematocyst tracks issuing in pairs 

 from the four marginal bulbs, soon divergent and continued at equal distances upward almost to the 

 apex, which is a little depressed. The nematocyst tracks fairly broad below, tapering upward, running 

 along the edges of eight prominent adradial ridges, separated by well-marked perradial and inter- 

 radial grooves. Manubrium half as long as the height of the umbrella-cavity, with a quadrangular 

 base broadly attached to the subumbrella. No gastric peduncle. Mouth tube narrow, mouth a 

 simple circular opening with a slightly thickened rim. Stomach circular in transverse section, com- 

 pletely surrounded by the gonad, which forms four large interradial sac-shaped pouches hanging 

 down from the middle portion of the manubrium almost to the level of the mouth. 



No apical canal ; four radial canals and ring-canal narrow. Velum narrow. Two opposite moniliform 

 tentacles with large, conical basal bulbs and two rudimentary marginal bulbs. 



The most characteristic features of this species are the four large, pendent gonadial sacs on the 

 stomach wall. Similar structures occur in two other medusae (belonging to the same family, but which 

 are in other respects entirely different from Ectopleura), namely, the Japanese species Gotoea typica 

 Uchida {igzyb, p. 195) and an undescribed South African species of the genus Paragotoea Kramp. 



The single specimen of the present species was taken in the tropical East Pacific not far from the 

 coast of Ecuador. 



Family Cytaeidae 



Cytaeis tetrastyla Esclischoltz 1829 



Occurrence: St. 282. 12. viii. 27. 01° 11' S, 05° 38' E. Gulf of Guinea. Net: TYF 30o(-o) m. 2 specimens. 

 St. 677. 28. iv. 31. 31° 16' 15" S, 29° 56' 30" W. Off southern part of Brazil. Net: TYFB 420-0 m. i specimen. 

 St. 691. 8. V. 31. 00° 25' 45" S, 29° 56' W. South of St Paul's Rocks. Net: TYFB 400-0 m. 2 specimens. 

 St. 694. 10. V. 31. 04° 05' 30" N, 30° 00' W. North of St Paul's Rocks. Net: TYFB 210-0 m. 4 specimens. 

 St. 701. 16. X. 31. 14° 39' 18" N, 25° 51' 21" W. Near Cape Verde Islands. Net: TYFB 242-0 m. 48 specimens. 

 St. 705. 20. X. 31. 00° 03' 24" N, 30° 36' 48" W. North-east of Cape San Roque, Brazil. Net: TYFB 150-0 m. 



I specimen. 

 St. 707. 22. X. 31. 06° 44' S, 33° 33' W. Off Cape San Roque, Brazil. Net: TYFB 182-0 m. i specimen. 



The specimens vary in size from 1-5 to 5 mm. in diameter. Those from Stations 677, 691 and 694 

 (28. iv-io. V. 1931) carry medusa buds on the stomach wall; the specimens from Station 282 (12. viii. 

 27) and Stations 705 and 707 (20-22. x. 31) have no buds. Among the forty-eight specimens from 

 Station 701 (16. x. 31), 29 have medusa buds. 



Distribution. Widely distributed in all tropical seas. The localities, where this species was col- 

 lected by ' Discovery ' and 'Discovery 11 ', are scattered over the tropical belt of the Atlantic between 

 Africa and South America. 



