132 



filiform, those composing the distal verticil shorter and capitate. 

 Güüosome unknown. 



V. hurailis Aid., V. proteus Wrglit. 



Heterostephanus n. gen. (= Heteractis AUra.) Hydrocaulus 

 simple aad solitary, destitute of perisarc. Hydranths with two ver- 

 ticils of tentacles, a proximal and a distal; the tentacles composing 

 the proximal verticil filiform, those composing the distal verticil 

 shorter and capitate. Planoblasts borne on peduncles which ai'ise 

 between the two tentacular verticils(?). Umbrella in the form of a shal- 

 low bell, with one large marginal tentacle and three radimental ones. 



H. annulicornis Sars. 



Acharadria Wrght. Hydrocaulus simple or irregularly brauched, 

 with a well developed perisarc. Hydranths with two verticils of 

 tentacles, those composing the proximal verticil filiform, those com- 

 posing the distal verticil shorter and capitate. Gonosome unknown, 



A. larynx Wrght. 



Acaulis Stimps. Hydrocaulus unknown. Hydranth sub-cj'lindri- 

 cal ; tentacles of the proximal set long, filiform, disposed in a siugle 

 verticil near the proximal extremity of the hydranth; those of the 

 distal set short, capitate, scattered upon the body of the hydranth. 

 Gonophores sessile, scattered, springing from the body of the hy- 

 dranth, between the proximal and distal set of the tentacles. Form 

 of medusa unknown. (Den bis jetzt allein beobachteten freien Zu- 

 stand hält Verf. für zufällig durch x\btrennung vom Stocke entstanden.) 



A. Primarius Stimps. 



Farn. Cladocoryuidae. Hydranthus with both simple and 

 ramified capitate tentacles. Gonosome not knowu. 



Cladocoryne Rotch. Hydrocaulus developed, invested by a 

 chitinous perisarc and rooted by a creeping filiform hydrorhiza. Hy- 

 dranthus claviform with a single verticil of simple capitate tentacles 

 round the mouth and several verticils of branching capitate ten- 

 tacles on the rest of the body. Gonosome not known. 



Cl. floccosa Rotch. 



Farn. Myriothelidae. Hydranth solitary, attached; tentacles 

 scattered, capitate. Hydrocaulus not developed. Gonophores fixed 

 sporosacs borne on special processes which spring from the body of 

 the hydranth. 



MyriothelaSars (= Candelabrum Bl., Arum Vig., Spadix Gosse). 

 Hydranth claviform or sub-cylindrical, springing from a broad adhe- 

 rent hydrorhiza, which is invested with a perisarc; tentacles very 

 small, papilliform. Processes which support the sporosacs naked, 

 springing from the hydranth at the proximal side of the tubercles. 



N. phrygia Fabr. (= M, arctica Sars). 



