866 Prof. Allman on the Construction and 
caulus rooted by a filiform hydrorhiza, the whole invested by a 
periderm. Polypites developed from the summits of the branches, 
fusiform, with a conical metastome ; tentacles filiform, in a single 
verticil round the base of the metastome. 
Gonosome.—Gonophores phanerocodonic, developed from the 
ceenosarc. Meduse, at the time of liberation, with a deep bell- 
shaped umbrella; manubrium shorter than the height of the 
bell-cavity, with four oral tentacles ; radiating canals four, each 
terminating, at its intersection with the circular canal, in a bulb, 
from which two tentacles are developed, each with an ocellus at 
its base. 
Before attaining maturity, the oral tentacles become dichoto- 
mously branched, and the bulbs upon the margin of the umbrella 
carry each a fasciculus of numerous tentacles, every tentacle 
having an ocellus at its base. 
Bougainvillia ramosa, Van Beneden (sp.), = Eudendrium ra- 
mosum, Van Ben., = Tubularia ramosa, Dalyell, = Atractylis ra- 
mosa, Wright, = Margelis ramosa, Agassiz. 
Bougainvillia fruticosa, Allm. 
Bougainvillia muscus, Allm. 
Dicorynide. 
1. Dicoryne, Allman. 
Trophosome.—Ceenosare consisting of a branched or simple — 
hydrocaulus, which arises from a creeping, filiform and anasto- 
mosing hydrorhiza, the whole invested by a periderm. Polypites — 
fusiform, with a single verticil of tentacula surrounding the base — 
of a conical metastome. 
Gonosome.—Gonophores adelocodonic, developed upon gono- 
blastidia which are borne either upon the hydrocaulus or the 
hydrorhiza. Sporosacs natatory, ciliated over their whole sur- — 
face, and having two filiform tentacula diverging from the proxi- 
mal end. 
Dicoryne conferta, Alder (sp.). 
Tubularide. 
1. Tusuxarta, Linn. (in part). 
Trophosome.—Ccenosare invested by a chitinous periderm, and 
consisting of a simple or branched hydrocaulus rooted by a fili-- 
form hydrorhiza. Polypites flask-shaped ; tentacles filiform, im 
two verticils, those composing the proximal verticil longer than — 
those composing the distal; distal verticil surrounding the base — 
of a conical metastome. 
Gunosome.—Gonophores adelocodonic, developed upon ra- : 
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