352 Prof. Allman on the Construction and 
one from each of the intermediate bulbs, as the observations of 
Gegenbaur on this Hydroid go to prove. 
Campaniclava Cleodore, Gegenb. (sp.),= Syncoryne Cleodore, 
Gegenb. 
4. Turris, Lesson. 
Trophosome.—Ccenosarc invested by a periderm, and consisting 
of a creeping filiform hydrorhiza, with a rudimental hydrocaulus, 
which forms very short tubular processes supported on the free 
surface of the hydrorhiza, and carrymg the polypites on their 
summits. Polypites claviform, with scattered filiform tentacula. 
Gonosome.—Gonophores phanerocodonic. The mature Medusa 
has a subcylindrical umbrella, with four or eight longitudinal 
bands; manubrium massive, with a four-lipped mouth ; radiating 
canals four ; marginal tentacles numerous, each with a bulbous 
base having a distinct ocellus. 
The trophosome of Turris was discovered by Gosse, who traced 
its development from the eggs of Turris neglecta, Forbes. It was 
afterwards observed by Dr. Strethill Wright, who carried its develop~ 
ment still further, and named it Clavula Gossit. 
We do not yet know anything as to the part of the trophosome 
from which the gonophores are developed, nor of the condition of 
the Medusze at the time of their liberation. 
Turris neglecta, Forbes. Trophosome = Clavula Gossu, 
Wright. 
5. Corpyztopnora, Allman. 
Trophosome.—Ceenosare a creeping filiform hydrorhiza sup- 
porting a well-developed branching hydrocaulus, the whole in- 
vested by a chitinous periderm. Polypites fusiform, developed 
from the extremities of the branches; tentacula filiform, scat- 
tered on the body of the polypite. 
Gonosome.—Gonophores adelocodonic, borne on the hydro- 
caulus, never on the polypite. 
Cordylophora lacustris, Allm. 
Cordylophora albicola, Kirchenpauer. 
6. CorypENDRIUM, Van Bencden. 
Trophosome.—Ccenosarc consisting of a rooted and branching 
hydrocaulus invested by a periderm. Polypites developed from 
the extremities of the branches, fusiform, with scattered filiform 
tentacula. 
Gonosome.—Gonophores phanerocodonic, developed from the 
coenosare. Form of Medusa unknown. 
Corydendrium parasiticum, Van Ben., = Syncoryne parasitica, 
Ehrenb., = Sertularia parasitica, Cayolini, 
