124 



Cl. discreta xillm.), CI. diffusa AUm., Cl. leptostyla Ag., Cl. nodosa 

 Wrght. 



Rhizogeton Ag. Hydiücauliis evauesceiit. Hydrorhiza a cree- 

 ping tubulär stoloii , invested by a delicate perisarc. Hydranths 

 sessile on the hydrorhiza, elongated, subcylindrical, carrying towards 

 their distal extremity scattercd filiform tenlacula. Sporosacs sprin- 

 ging frora the hydrorhiza. 



Rh. fusiformis Ag. 



Cordylophora Allm. Hydrophyten consisting of a well develo- 

 ped ramified hydrocaulus, which Springs from c creeping filiform 

 hydrorhiza; the whole invested by a perisarc. Hydranths fusiform, 

 Sporosacs borne on the hydrocaulus. 



C. lacustris AUm., C. albicola Kirchenp. 



Tubiclava Allm. Ilydrophytou consisting of a conspicuous hy- 

 drocaulus iu the form of simple or branched stems, and of a cree- 

 ping filiform hydrorhiza; the whole invested by a chitinous peri- 

 sarc. Hydranths claviform, with scattered filiform tentacles. (Gono- 

 phores adelocodouic, boruc by the liydranth at the proximal side of 

 the tentacles?) 



T. lucerua Allm., T. fruticosn n. sp. Tenby. 



Merona Norm. IIydrü|)hyLon consisting of a devcloped hydro- 

 caulus and a creeping filiform hydrorhiza; the whole invested by a 

 chitinous perisarc. Hydranths claviform. Sporosacs borne on bla- 

 stostyles, which spring directly from the creeping hydrorhiza. 



M. cornucopiae Norm. 



Farn. Turridae. Hydrocaulus rudimental or devcloped. Hy- 

 dranths with scattei'od filiform tentacles. Gonophores medusiform; 

 planoblasts with simple radiating canals and simple marginal tentacles. 



Turris Less. Hydrophyton consisting of a creeping filiform 

 hydrorhiza and a rudimental hydrocaulus, the whole invested by a 

 perisarc. Hydranths claviform. Gonophores phancrocodonic. Umbrella 

 of mature mcdusa subcylindrical: manubrium massive, with a four- 

 lipped mouth; radiating canals four; marginal tentacles uumerous, 

 cach with a bulbous base having a distinct ocellus. 



Turris neglecta Less. (mit Clavula Gossii Str. Wright). 



Campauiclava Allm. Hydrophyton a creeping filiform hydro- 

 rhiza; umbrella at the time of liberation deep bell-shaped; manu- 

 brium destitute of oral tentacles; radiating canals four; marginal 

 tentacles two, coiitinuous with two opposite radiating canals and 

 having bulbous bases without ocelli, two interveuing smaller bulbs 

 corresponding with the terrainations of the other two radiating canals 

 in circular canal. 



C. cleodorae Gegenb. 



Corydendrium van Bened. Hydrophyton consisting of a well- 



