der niederen Thiere während der J. 1864—1865. 77 



eine Acrocyste entleert wird), Campanulina van Ben. (2 Arten mit 

 freien Geschlechtsth.) 



2. Farn. Aequoridae. Zygodactyla Brdt. (Z. vitrea Gosse, die 

 einzige Aequoride bekannter Abstammung.) 



3. Farn. Thaumantidae. Thaumantias Gegenb. (Th. incon- 

 spiciia Forb., deren Hydroidzustand nach Wright mit Campanu- 

 laria raridentata Aid. nahe verwandt ist.) 



4. Farn. Leptoscyphidae. Leptoscypkus n. gen. (L. tenuis 

 All. mit Lizzia-artigen Medusen), Lafoea Lam. (4 Arten mit freien 

 Geschlechtsth.) 



5. Fam. Lineolaridae. Lineolaria Hincks (1 Art mit noch 

 unbekannten Geschlechtsth.). 



Als Probe der von unserem Verf. geübten Behandlung lasse 

 ich hier die Diagnosen der neu aufgestellten Genera folgen. (lieber 

 die Terminologie des Verf. vgl. die früheren Berichte.) 



Rh iZ'O cline Allm. Coenosarc forming an adherent Stratum 

 supported by a solid chitinous expansion. Polypites developed at 

 intervals from the free surface of the coenosarc ; tentacles filiform, 

 in a Single verticil round the base of a conical metastome. Gono- 

 phores phanerocodonic, sessile on the free surface of the coenosarc. 

 Umbrella, at the time of liberation, deep bell-shaped; manubrium 

 large, with a four-lipped mouth, but not extending beyond the 

 margin of the umbrella; four radiating canals continued distally by 

 four marginal tentacles with bulbous bases; three shorter tentacles 

 developed in each interradial space. 



Heter actis Allm. Polypite solitary, born on the summit 

 of a simple rooted hydrocaulus; two verticils of tentacles, a proxi- 

 mal and a distal ; the tentacles composing the proximal verticil long 

 and annulated, those composing the distal verticil short and capitate. 

 Gonophores phanerocodonic, borne upon peduncles, which arise from 

 the body of the polypite at the distal side of the proximal verticil 

 of tentacles. Umbrella in the form of a shallow bell, with four ra- 

 diating canals, one large marginal tentacle and three rudimen- 

 tal ones. 



Heter ocordylus Allm. Coenosarc consisting of a simple or 

 branched hydrocaulus, which arises from a creeping, filiform and ana- 

 stomosing hydrorhiza, the whole invested by a chitinous periderm. 

 Polypites fusiform, with-a single verticil of filiform tentacula round 

 the base of a conical metastome. Gonophores adelocodonic, borne 

 by gonoblastidia, which are depeloped (solely?) from the hydrorhiza ; 

 sporosacs of the ordinary kind, destitute of tentacles and cilia and 

 incapable of locomotion. 



Monocaulos Allm. Polypite solitary, borne on the sura- 



