TRACHYMEDUS.E — L1RI0PE. 



417 



Liriope rosacea Gegenbaur. 



Plate 52, fig. 1. 



( ?) Geryonia tetraphylla, Chamisso et Eysenhardt, 1821, Nova Acta Phys. Med., Acad. Leop. Carol., tome 10, p. 357, fig. 



Geryonia rosacea, Eschscholtz, 1829, Syst. der Acal., p. 89, taf. 11, fig. 2. 



Liriope rosacea, Gegenbaur, 1856, Zeit. fur wissen. Zool., Bd. 8, p. 257. — von Lendeneeld, 1885, Proc. Linnean Soc. New 



South Wales, vol. 10, p. 241. — Maas, 1897, Mem. Mus. Comp. Zool. at Harvard College, vol. 23, p. 26, taf. 3, fign. 7,8. 

 Liriope rosacea+L. crucifera, Haeckfl, 1879, Syst. der Medusen, p. 290. 



Liriope compacta, Maas, 1893, Ergeb. der Plankton Expedition, Bd. 2, K.c, p. 37, taf. 3, fig. II, 

 Liriope compacta (mature medusa), M.US, ! 905> Craspedoten Medusen der Siboga Expedition, Monog. 10, pp. 61, 62, taf. 9, 



fign. 55-59. 

 Liriope sp., Maas, 1893, Ergeb. der Plankton Exped., Bd. 2, K. c, p. 38, taf. 4, fign. 3 to 6. 



When fully grown the bell is 40 to 50 mm. wide, slightly flatter than a hemisphere, with 

 fairly thick, gelatinous substance; it is evenly rounded without an apical projection. The 4 

 hollow, radial tentacles are about twice as long as bell-diameter. There are 7 blindly ending 

 centripetal canals in each quadrant. The peduncle is about half as wide as the bell itself at 

 its base and tapers gradually to a narrow, distal apex at stomach. It is 1.25 to 1.5 times as 

 long as bell-diameter. The gonads are developed upon the outer, subumbrella parts of the 

 radial-canals near ring-canal. When fully developed they extend along three-quarters or 

 more of the subumbrella lengths of the radial-canals from the ring-canal toward the base of 

 the peduncle. At first the gonads are equilateral and triangular with a bluntly rounded angle 

 touching the ring-canal, but later the sides extend out in a ring-like manner so as to touch in 



V3 a - 



Fig. 273. — Liriope tetraphylla, after Vanhbffen, in deutsch. 



Tiefsee Expedition, Valdivia. 

 Fig. 273a. — Liriope tetraphylla, after Chamisso and Eysenhardt, 



1821, Nova Acta Phys. Med. Nat. Curios., tome 10. 



the 4 interradii (see Maas, 1905, taf. 9, fign. 55, 57). Each gonad is then a broad, wide triangle 

 with concave lateral sides and with the upper (centripetal) side bowed outward on both sides 

 of the middle line, with all of the angles "cut off," or bluntly rounded. 



In Tortugas specimens the entoderm of the gonads and tentacles is pink, the stomach 

 green, and the lips rose-red. 



This form is described by Maas from the coast of Brazil near the equator and I have 

 taken it occasionally at Tortugas, Florida. In 1905 Maas gives an excellent series of figures 

 of specimens of this medusa from the Malay Archipelago, and these make it all but certain that 

 L. rosacea Eschscholtz, and L. crucifera Haeckel, from the Pacific and Indian Oceans, are only 

 young and half-grown stages of L. compacta Maas, 1 905 (see text-figure 271 ). The medusa should 

 therefore be known by its oldest ascertainable name: L. rosacea Eschscholtz. It is evidently of 

 world-wide distribution in tropical oceans and is the largest known species of Liriope when 

 mature. L. tetraphylla is probably only another name for a growth-phase of this medusa. 



