866 Prof. AllmaD 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 

 coenosarc. Medusae, 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., = Tuhularia ramosa, Daly ell, =Atractylis ra- 

 mosa, Wright, = Margelis ramosa, Agassiz. 



Bougainvillia fruticosa, Allm. 



Bougainvillia muscus, Allm. 



DicdrynidsB. 

 1. DicoRYNE, Allman. 



Trophosome. — Coenosarc 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.). 



Tubularidae. 

 1. TuBULARiA, Linn, (in part). 



Trophosome. — Coenosarc invested by a chitinous periderm, and 

 consisting of a simple or branched hydrocaulus rooted by a fili- 

 form hydrorhiza. Polypites flask-shaped ; tentacles filiform, in 

 two verticils, those composing the proximal verticil longer than 

 those composing the distal ; distal verticil surrounding the base 

 of a conical metastome. 



Gonosome. — Gonophores adelocodonic, developed upon ra- 



