168 



MF.TH'S.-E OK THE AVORLD. 



Bougainvillia pyramidata. 



Hipforrrur f\ramiilaia, FORBES AND GOODSIR, 1853, Trans. Roy. Soc. Edinburgh, vol. 20, p. 312, plate 10, fie. 4. HAFCKH , 

 iSSo, Syst. .ICT Mcilusrn, p. 635. BROWNE, 1905, Proc. Roy. Soc. Edinburgh, vol. 25, p. 75?. 



Bell semiglobular, 2.5 to 6 mm. wide and equally high. Bell-walls thick and gelatinous 

 substance at apex well developed. The 4 marginal tentacle-bulbs are very small and globular, 

 and each one bears 6 to 8 tentacles which have ocelli and are somewhat shorter than the 

 bell-diameter. The stomach is mounted upon a short, conical peduncle. It is cruciform and 

 its 4 lobes extend along the entire length of the peduncle. The mouth is a circular opening. 

 The 4 oral tentacles branch twice dichotomously. The gonads are upon the basal margin 

 of the stomach and its lobes. The radial-canals are straight and narrow. Stomach, gonads, 

 and tentacle-bulbs orange-yellow to reddish-brown. Tentacular ocelli black. Found off 

 the west coast of Scotland and off the south coast of Ireland. 



Bougainvillia nordgaardii. 

 Margtlis nordgaarJii, BROWNF, 1905, Bergens Museums Aarbog, No. 4, p. 14, plate 2, fig. I, plate 3, figs. <, 6. 



Bell 4 mm. wide, 4 mm. high. Bell-walls uniform and of moderate thickness. Bell 

 dome-like, evenly rounded. 5 to J tentacles in each of the 4 radial bulbs. No ocelli. Ten- 

 tacles somewhat longer than the bell-diameter. 

 Velum narrow. Stomach half as long as the depth 

 of the bell-cavity. 4 oral tentacles, 4 or 5 times 

 dichotomously branched. 4 wide, mterradial, 

 gonads on the sides of the stomach. Gonads and 

 tentacle-bulbs yellowish-brown (in formalin). 

 Byfjord, near Bergen, Norway. Distinguished 

 by its lack of ocelli. 



For details see tabular synopsis of medusae of 

 Bougainvillia. 



Bougainvillia flavida Hartlaub. 



Bougainvillia 



imillin faritla, HARTLAUB, 1897, Wissen. Meeresuntersuch. 

 Koinmis. Deutsch. Meere Kiel, Helgoland, Neue Folge, Bil. 

 i, p. 456, taf. 14, figs, i-io; taf. 15, figs. 4-6, 8. 



The mature medusa is slightly higher than a 

 hemisphere with an evenly-rounded bell. The 

 gelatinous substance is thick, so that the bell- 

 cavity is only a little more than half as deep as 

 the bell-height. The bell is 2 or 3 mm. wide. There 

 are 4 radially placed clusters of marginal tentacles 

 with not more than 6 tentacles in each cluster. 

 These tentacles are about as long as the bell- 

 diameter and each one has a large ocellus upon its 

 velar side near the base of the cluster. The 4 com- 

 mon, basal bulbs are swollen, semiglobular, and 

 well developed. 4 quite wide, straight radial-canals 

 and a narrow, simple, circular vessel. Manubrium small, conical, half as long as the depth of 

 the bell-cavity. Without a peduncle. The 4 oral tentacles branch dichotomously about 3 

 times. With mterradial, undivided gonads. Entoderm of manubrium and tentacle-bases 

 orange-yellow. 



The mature medusae are found at Helgoland, German Ocean, in August and September. 

 Hydroid. The hydrorhiza is net-like, creeping, and yellowish-brown in color. The 

 stems arise at quite infrequent intervals and are unbranched, very slender below and swollen 

 above at the polypite. They are 5 to 7 mm. high and light gray-brown in color. The hydranths 

 are elongate, club-shaped, with 8 to 10 tentacles in a single zone around the mouth. The 

 medusa-buds are produced upon branching processes which arise from the sides of the stem 

 near the base of the polypite, or from points lower down upon the side of the polypite 



!i',.<ji. Bougainvillia nordgaardii, after Browne 

 Hergens Museums Aarbog, 1903. 



