566 



MEDUS.E OF THE WORLD. 



AtoUa chuni VanhoSen. 



Alalia chuni, VANHorrtN, 1902, Wissen. Ergcb. dcutsch. Tiefscc Expedition, Dampfer Valdivin, Bd. 3, Lief. 1, p. 12, taf. i , 

 figs. I, 2; taf. 5, fig. 26.— Browne, 1908, Trans. Roy. Sec. Edinburgh, vol. 46, p. 240. 



Bell 27 to 50 mm. wide, 9 to 15 mm. high. Central lenticular disk 14 to 27.5 mm. wide 

 with 23 faint radial furrows at the margin. Annular furrow 0.5 to 1.75 mm. wide. Zone 

 of pedalia 2.25 to 3.5 mm. wide. 24 tentacles. Species distinguished by 7 to 9 small, pearl- 

 colored, papilla-like protuberances over the exumbrella surfaces of each marginal lappet; 

 commonly with one papilla in the center and the others in two lateral rows. 2 specimens found 

 by the J'ahUvla off Cape of Good Hope, Africa, November 18, 1898; and I by the Scot- 

 tish Antarctic Expedition, in a trawl at 1,332 fathoms, in the same region. 



Fig. 359. — Atolla gigantea, after Maas, in Mem. Mus. of Comp. Zool. at Harvard College. 



Fig. 360. — Atolla chuni, after Vanhoffcn in Faldivia Expedition. 



Fig. 361. — Atolla wyvitlei, 0.75 natural size, drawn by the author, from a specimen in the National Museum, Washington. 



Atolla wyvillei Haeckel. 



Atolla wyvillei, Hakckel, 1880, Syst. der Medusen, p. 48S; 1881, Report, Challenger Expedition, Zool., vol. 4, p. 113, plate 29, 

 figs. 1-9. — RouLE, 1896, Result. Scientifique Camp. Caudan, Tome i, Lyon, p. 302 (Bay of Biscay, France, depth of 350 

 to 850 fathoms). — Maas, 1897, Mem. Museum Comp. Zool. at Harvard College, vol. 23, p. 79. — Vanhofeen, 1902, 

 Wissen. Ergcb. deutsch. Tiefsee Expedition i'aldivia, Bd. 3, Lfg. i, p. 13, taf. 5, fig. 22; 1908, dcutsch. Siidpolar Expe- 

 dition, Bd. 10, Zool. 2, p. 37. — Browne, 1908, Trans. Roy. Soc. Edinburgh, vol. 46, p. 241. — Bicelow, H. B.. 1909, .Mem. 

 Museum Comp. Zool. at Ha^^•ard College, vol. 37, p. 39, plates 8-10. 



( .') Collaipii achillis, R^eckel, 1880, loc.cit., p. 489. 



Alalia alexandrl, Maas, 1897, Mem. Afuseum Comp. Zool. at Harvard College, vol. 23, p. 81, taf. II, fig. 2; taf. 14, figs. 4, 5. — 

 .Agassiz, a., and Mayer, 1902, Mem. Museum Comp. Zool. at Harvard College, vol. 26, p. 156. — -Maver, 1906, Bull. 

 U. S. Fish Commission, vol. 23, p. 1138, plate 2, fig. 7; plate 3, figs. 10, 11. 



This species is characterized bv the numerous, wide, radial notches or furrows in the 

 margin of the central lens of the exumbiella. These are much wider and deeper than in J. 

 verrillii. Exumbrella surface of lappets smooth, not beset with papillae as in J. chuni. This 

 medusa is probably identical with CoUaspis achillis Haeckel, but in the latter the furrows of 

 the central lens are represented as deep, narrow clefts, whereas in A .icxviUei the)' are shallow 

 notches which varv greath' in prominence in individual medus.T. Moreover, in A. uyvillei 

 the pedalia are short and broad, while in ./. achiUts the\- are long and narrow. The central 

 lens and the pedalia are separated only bv a ring-furrow and there is no prominent ridge periph- 

 eral to the rins;-furrow such as is seen in A . hairJii. The medusa becomes ~^ mm. wide and 

 there are usualh- about 22 to 28 tentacles. The bell is flatter than a hemisphere. Found in the 

 Antarctic and Southern .'\tlantic and Pacific. The Albatross obtained it in the Philippine 

 Islands, tropical Pacific. 



