444 Leuckart: Bericht üb. d. wlsseüschaftlichen Leistungen 



filiform, those composing Ihe distal verticil shorter and capitate. 

 Gonosome unknown. 



V. humilis Aid., V. proteus Wrght. 



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

 simple and solitary, destitute of perisare. 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 arise 

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

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



H. annulicornis Sars. 



Acharadria Wrght. Hydrocaulus simple or irregularly branched, 

 with a well developed perisare. 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-cylindri- 

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

 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 Abtrennung vom Stocke entstanden.) 



A; Primarius Stimps. 



Fam. Clad ocorynidae. Hydranthus with both simple and 

 ramified capitate tentacles. Gonosome not known. 



Cladocoryne Rotch. Hydrocaulus developed , invested by a 

 chitinous perisare 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. 



Gl. floccosa Rotch. 



Fam. 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. 



Myriothela Sars (= Candelabrum Bl., Arura Vig., Spadix Gosse). 

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

 rent hydrorhiza, which is invested with a perisare; 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). 



