353 Prof. Allman on the Construction and 



one from each of the intermediate hulbs, as the observations of 

 Gegenbaur on this Hydroid go to prove. 



Campaniclava Cleodorce, Gegenb. (sp.),= Syncoryne Cleodora, 

 Gegenb. 



4. TuRRis, Lesson. 



Trophosome. — Coenosarc 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 carrying 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 Gossii. 



"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 Medusae at the time of their liberation. 



Turris neglecta, Forbes. Trophosome = Clavula Gossii, 

 Wright. 



5. CoRDYLOPHORA, Allman. 



Trophosome. — Coenosarc 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. CoRYDENDRiUM, Van Beneden. 



Trophosome. — Coenosarc 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 

 coenosarc. Form of Medusa unknown. 



Corydendrium parasiticum, Van Ben., = Syncoryne parasitica, 

 Ehrenb., = Sertularia parasitica, Cavolini. 



