ANTHOMEDU8.fi BOUGAINVILLIA. 



161 



The mature medusa is described by Maas, Dr. Agassiz and his assistant ha\ ing found only 

 immature specimens. 



Mature tni'Jusa. Bell 8 to 14 mm. high, with thick, vertical sides and flatly rounded top, 

 4 radially placed clusters of marginal tentacles with about 15 to 20 tentacles in each cluster. 

 These tentacles are not half as long as the bell-height and are clavate and flexible. There is 

 an ocellus on the velar (inner) side of the base of each tentacle. There are 4 straight radial- 

 canals which widen as they join the 4 corners of the stomach. The manubrium is wide at its 

 base and lacks a peduncle. It is about half as long as the bell-height. The 4 oral tentacles 

 branch dichotomously 8 times, and their tips end in knob-like expansions, armed with bristling 

 nematocysts. There are thus 256 tips to the oral tentacles in each quadrant. 



There are 8 gonads, 2 upon each interradial side of the stomach. These <;onads are dis- 

 tinctly separated in the 4 principal radii. 



The entoderm of the stomach and tentacle-bulbs is orange-yellow or yellowish-green to 

 brownish-yellow. The gonads are dark-yellow to brown. This medusa is abundant over the 

 western parts of the tropical Pacific, Fiji, Kllicc Islands. Malay Archipelago West Coast of 

 Mexico, Acapulco Harbor. 



Bougainvillia britannica Forbes. 

 Plate 17, fig. 8. 



lltppvcrtne britannica, FORBKS, 1X41, Annals ami Mag. Nat. Hist., vol. 7, p. 84, plate i. fit;, i. 



Bougainvillea britannica, FoRRts, 184X1 British Naked-eveti Medus.T. p. (12, pl.tte 12. fig. I. 



Euilfndrium ramosum, VAN BENEDEN, 1844, Mem. Acad. Belgu|ue, tome 17, p. 56, planclir 4; iSdo, F;mn.i I.ittor. Belgique, 



p. 112, plates 6, 7. 

 Bougainvillea ramosa, ALLMAN, 1871, Monog. Tub. Hvdr., p. 311, plate 9, figs. 5-7 (hydroid and medusa). BOCHU, 1878, 



Jena. Zeitsch. fur Naturw., Bd. u, p. 189, taf. 6, fig. 6. 

 Margtlis ramosa, HAECKEL, 1879, Syst. der Medusen, p. 88. 

 (?)Ltzusa octocilia (young medusa), HAECKEL, Ibid., p. 80. 

 Bougainvillia ramosa, WEISMANN, 1883, Entstehung Seiualzellen bei Hydromcdusen, (rn.i, pp. 1 13, 218. BII.I.ARD, 1906, Bull. 



Mus. Hist. Nat. Paris, No. 5, p. 330. 



( ?) Bougainvillia ramosa, PICTET, 1893, Revue Suisse Zoo!., tome I, p. II (hvJnnil Ironi Atnhoin.i, M.il.tv Archipellgo). 

 Lizusa octocilia Dalyell = Bougainvillia ramosa Btihm, HARTI.ACB, 1894, \Visscn. Meercsuntcrsuch. Kciinni. Mern- Kiel, 



Helgoland, Neue Folge, Bd. r, p. 190. 



\targelis britannica (Forbes), BROWNE, 1895, Trans. Liverpool Biol. Soc., vol. 9, p. 167. 

 Bougainvillia ramosa, BROWNE, 1898, Journ. Marine Biol. Assoc., N. S., vol. c, p. 187 (hydroid). 

 Margrlis ramosa, BEDOT, 1905, Revue Suisse de Zool., tome 13, p. 138 (citation of papers to 1850). 

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



Bougainvillia benedenii, BONNEVIE, 1898, Zeit. fur wissen. Zool., Bd. 63, p. 484, taf. 26. fign. 34. ;<; (degenerating hydroid). 

 (?) Bougainvillia obscura, BONNEVIE, 1898, Bcrgens Museums Aarbog, No. 5, p. 7 (perisarc unringed, 15 tentacles of various 



lengths). 

 Bougainvillia bella, HARTL.AUB, 1897, Wissen. Meeresuntersuch. Kommis. Mcrr<- Kiel, Helgoland, Ncut* Fnli;r. HJ. 2, p. 470, 



taf. 15, fig. 7; taf. l6a, figs. 6, 1 1 = B. britannica, Forbes, Hartlaub, 1904, Ibid., B.I. 5, p. 10;. 

 ( .' ?) Bougainvillia muscus, THORNELY, 1900, Zoological Results, A. Willey, Part 4, p. 452 (hydroid from tropical Pacific). 



Bell about 12 mm. high and 10 mm. wide. High, dome-like, rounded, with very thick 

 walls. Each of the 4 radially placed, marginal tentacle-bulbs gives rise to ifi to 24 short 

 tentacles, about one-fourth as long as the bell-diameter. Each tentacle is provided with a 

 basal ocellus on its inner (velar) side. The ocelli are black in the adult, but mav In red in 

 the young medusa. 



4 quite wide radial-canals. Manubrium short and wide without a peduncle. The 4 

 oral tentacles branch dichotomously 6 to 7 times. There are 8 adradial gonads in the ecto- 

 derm on the sides of the stomach. The ripe eggs are not inclosed in nematocyst capsules 



Distinctions l>ct 



,d n. 



supcrciltarts. 



