ANTHOMEDrS.-TC RATHKKA. 



1X1 



extend to the level of the velar opening. The gonads are on the 4 interradial sides of the 

 stomach. They are doubly cleft in each interradius so as to present the appearance of 4 

 longitudinal hands below, but are (used above, forming a double horseshoe. The tentacle- 

 bulbs have decided red, entodermal pigment. The stomach is reddish-brown and the eggs 

 appear as flecks of yellow. 



Found in the Malay Archipelago, Ternate, 3 46' S. lat., 127 47' long. E. from Greenwich. 



It is possible that Lizzt-lln nitflla Haeckel may be identical with this species. Haeckel 



gives a very brief description ot this medusa as follows : Bell egg-shaped, i 5 mm. high, 10 mm. 



wide. Stomach globular or almost cubical, about 

 as long as its conical peduncle. Gonads 4-teathered 

 leaves in the stomach-wall. 8 simple, unbranched, 

 oral tentacles as long as the stomach. (Broken?) 

 8 marginal tentacle clusters, each with 8 long ten- 

 tacles. Coast of Japan. Color ( ?) 



Rathkea elegans. 



Plate 1 8, fig. 4. 



Li-Kin elegant, MAYKR, 1900, Bull. Mus. Comp. Zool. at Harvard 

 College, vol. 37, p. 44, plate 38, fig. 127. 



Bell 3 to 7 mm. in height and gelatinous 

 substance of moderate and nearly uniform thick- 

 ness. The sides of the bell are almost straight and 

 vertical and the top is dome-shaped. There are 8 

 groups ot marginal tentacles, 4 radial and 4 inter- 

 radial. Each radial group is composed of 4, and 

 each interradial ot 3 tentacles. The tentacles are 

 quite stiff and curve upward and are only about halt 

 as long as the bell-height. There is a small, dark- 

 FIC.. 95.- Rathkra octoiiemalis, after Maas, in Hydro- brown, ectodermal ocellus upon the under (velar) 



medusen Xih aS a Expedition. s j de Q f each tentac | e near the l)asa j |, u j b _ J ht . 



velum is wide and provided with strong muscles. There are 4 straight, narrow radial-canals 

 and a simple circular vessel. There is a well-developed, conical peduncle above the stomach, 

 down which the radial-canals lead in their course to the gastric sac. The gastric part of the 

 manubrium is cruciform in cross-section and pear-shaped in general longitudinal contour. 

 The mouth is a simple opening without prominent lips. I he oral tentacles arise from 4 radial 

 sides of the stomach at a short distance above the mouth. Each tentacle branches dichoto- 

 mously 3 times, and then each tip terminates in 3 small branches which are covered with 

 nematocysts. The entodermal cells of the oral tentacles are chordate. The genital products 

 are situated upon the tour interradial sides ot the stomach. 



The entoderm of the tentacle-bulbs and radial-canals is ot an intense, opaque, pearl-- 

 white color, often displaying a tinge of pink. The entoderm of the stomach is of an intense 

 green, and the oral tentacles are pearly-pink. The intense opaque color of the radial-canals 

 contrasting with the hyaline transparency of the bell renders this medusa one of the most beau- 

 tiful found at the Tortugas, Florida. Several specimens were captured early in July, iS<yc;. 



Rathkea blondina. 



Lis 



I.l 

 Dy 



Liz 



l>\ 

 Dv 



ia hlandina, FORBES, 1848, British Naked-eyed Medusa-, p. 67, plat.- 12, fig. 4. BI.DOT, 1905, Revue SUISM- 7..JC.I., Bd. I 

 p. H7 (literature 1X48-50). BROWNE, 1895, Trans. l,ivrrp<>! Biol. Sue., vol. 9, p. 265; 1896, 1'r.n . /on]. Sor. of Lon- 

 don for 1896, p. 475 (review of recent literature, etc.); 1898, Journal M.ir ..... liiol ._ A -. >. .. V S., vol. 5, p. rSX. 

 (FORBES), BROWNE, 1896, Proc. Zool. Soc. London, p. 475 



ia, s/>., CLAPAREDE, 1860, Zeit. fur wissrn. Zool., Bd. 10, p. 401, taf. 32, fign. i-}. 



marphesa minima (vounp stage)-!- Lizzia fltlparedei-^ L. blontlina, H*rKFI, 1879, Syst. der Mr.luvrn. pp. -SI, 82, taf. 6, 



fig- 7- 

 zia claparedei, CHUN, 1895, Bibliothi-ca Zoologies, Heft 19, p. 36 (budding of medusa-), figs. 2-4. HAK'KH. Lizzia blonilina, 



FORBES, BROWNE, 1905, Proc. Roy. Soc. Edinburgh, vol. 25, p. 754. 

 X,infd elhabetli,r, HAKCKKI., 1879, Svst. der Medusen, p. 83, laf. ft, fig. 12. 

 'inorphosa minima (young medusa), BROWNE, 1895, Trans. Liverpool Biul. Soc., vol. 9, p. 260. 

 smorphosa minima, HAECKEI.= Lizzia claparedei, HARTLAUB, 1897, Wissen. Meeresuntersuch. Deutsch. Meere, Ntue Fol 



Abth. Helgoland, Bd. 2, p. 455. HAECKFL= Lizzia clapandti, BROCII, 1905, Bergens Museum Aarbog, vol. u, p. 



Foltv, 

 5. 



