lli-4 



MKDl'S.K OF THE WORLD. 



where it commonly occurs in the fjords from November until June, but during the summer 

 it is found about a decree northward of Ekaterinen Harbor, in the cold water. At Helgoland 

 the medusa is most abundant in February and March. 



"Hippocrene inirea" Linko is only an Arctic form of Bougainvillia sitpercilians in 

 which the oral tentacles branch dichotomously 7 times, instead of 5 to 6 times as is commonly 

 observed. 



I am inclined to believe that Hippocrene boitganivillii Brandt ( = Bougainvillea mertensii 

 L. Agassiz) from Behrings Sea is identical with B. supercilians. 



Fin. 88. Bougainvillia supcrciliariS) after J>, Agassiz in Mt'in. Amer. Acad. 

 Arts ami Sci., 1849. Oral view of medusa. 



Bougainvillia dinema = B. superciliaris (?). 



Bougainvillea litnema, GREENE, 1857, Nat. Hist. Review, vol. 4, p. 246, plate 15, fig. 6. 

 Margflh zygonema, HAF.IKEL, 1880, Syst. tier Medusen, p. 635. 



I believe this medusa to be identical with B. superciliaris. (See tabular synopsis.) 



Bell oval with a constricted margin, 10 to 12 mm. high, 6 to 8 mm. wide. The 4 marginal 

 tentacle-bulbs are kidney-shaped and only half as wide as the intervals between them. Each 

 bulb bears 10 to 12 ocelli. Only 2 tentacles were observed by Greene and Haeckel on each 

 bulb, but the others had probably been broken off. The 2 were at the ends of the bulb. 



The stomach is roundish, 4-sided, smaller than the tentacle-bulbs, and hardly one-fourth 

 as long as the bell-height. The 4 oral tentacles branch dichotomously 4 or 5 times. The 

 gonads are 4 interradial, triangular to egg-shaped swellings on the sides of the stomach. 

 Stomach, gonads, and tentacle-bulbs yellow. 



East coast of Ireland. 



Bougainvillia multicilia. 



Lizusa multicilia, HAECKF.L, 1879, Syst. der Medusen, p. 81, taf. 6, fig. 13. 



Bell three-fourths spherical, with thin, uniform walls, evenly rounded, fi mm. high, 5 mm. 

 wide. 4 wide, kidney-shaped, marginal tentacle-bulbs, wider than the intervals between 

 them; each with 10 to 12 tentacles with ocelli, and about as long as the bell-radius. 4 straight. 



