436 Leuckarl: Bericht üb. il. wissenschaftlichen Leistungen 



Cl. discreta Allm.), Cl. diffusa AUm., Cl. leptostyla Ag., Cl, nodosa 

 Wrght. 



Rhizogcton Ag. Hydrocaulus evanesceut. Hydrorhiza a cree- 

 ping tubulär stolon , invested by a delicate perisarc. Hydranths 

 sessile on the hydrorhiza, elongated, bubcylindrical, carrying towards 

 their distal extremity scattered filiform tenlacula. Sporosacs sprin- 

 ging from the hydrorhiza. 



Rh. fusiformis Ag. 



Cordylophora Allm. Hydrophyton consisting of a well develo- 

 ped ramified hydrocaulus, which gpriugs from, e creeping filiform 

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

 Sporosacs borne on the hydrocaulus. 



C. lacustris Allm., C. albicola Kirchenp. 



Tubiclava Allm. Hydrophyton consisting of a conspicuous hy- 

 drocaulus in 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 adelocodonic, boruc by the hydranth at the proximal side of 

 the tentacles?) 



T. lucerna Allm., T. fruticom n. sp. Tenby. 



Merona Norm. Hydrophyton consisting of a developed hydro- 

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

 chitinous perisarc. Hydranths claviform. Sporosacs borne on bla- 

 atostyles, which spring directly from the creeping hydrorhiza. 



M. cornucopiae Norm. 



Farn. Turridae, Hydrocaulus rudimental or developed. Hy- 

 dranths with scattered filiform tentacles. Gonophores medusiform; 

 planoblasts with simple radiating canals and simple margiual tentacles. 



Turris Less. Hydrophyton consisting of a creeping filiform 

 hydrorhiza and a rudimental hydrocaulus, the whole invested by a 

 perisarc. Hydranths claviform. Gonophores phanerocodonic. Umbrella 

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

 lipped mouth; radiating canals four; marginal tentacles numerous, 

 each with a bulbous base having a distinct ocellus. 



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



Campaniclava 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, coutinuous with two opposite radiating canals and 

 having bulbous bases without ocelli, two intervening smaller bulbs 

 corresponding with the terminations of the other two radiating canals 

 in circular canal. 



C. cleodorae Gegenb. 



Corydendrium van Bened. Hydrophyton consisting of a well- 



