286 Lenckart: Bericht üb. d. Leist. in d. Naturgeschichte 



Lafoea Lamx. 5 Sp. mit L.pociUurn und L. pygmaea nn., Ca- 

 lycella Hincks 2 Sp., Cuspidella Hiucks 3 Sp., Salacia Lamx. (= 

 Grammaria Stpa.) 1 Sp., Filellum Hincks (= Reticularia Wyv. Th.) 

 mit Camp, serpens Haas. 



Farn. 5. Tricbydridae. Hydrothecae merely rudimentary, tu- 

 bulär; pülypites cyliudrical, very extensile, with a small (Konica! 

 proboscis. 



Trichydra St. Wr. 1 Sp. 



Farn. 6. GoppinÜdae. Hydrothecae united by an encrusting. 

 cellular mass. 



Coppinia Hass. mit 1 Sp. 



Farn. 7. HalecÜdae. Hydrothecae biserial, subsessile, jointed 

 to a lateral process from the stem; polypites partially retractile. 



Halecium Ok. (= Thoa Lamx.) 8 Sp., Ophiodes Hincks 1 Sp. 



Fam. 8. Sertularüdae- Hydrothecae perfectly sessile, more 

 or less inserted in the stem and branches; polypites wholly retractile, 

 with a Single wreafh of filiform tentacles round a conical proboscis; 

 gonozoids always fixed. 



Sertularella Gray 6 Sp. , Diphasia Ag. 7 Sp. , Sertularia L. 

 8 Sp., Hydrallmania n. gen, mit Sert. falcataL., Thuiaria Flem. 

 2 Spec. 



Fam. 8. Plamularüdae. Hydrothecae sessile and unilateral; 

 zoophyte furnished with nematophores ; polypites with a Single 

 wreath of filiform tentacles round a conical proboscis ; gonozoids 

 always fixed. 



Antennularia Lam, 2 Sp., Aglaophenia Lamx. 4 Sp. (mit Ne- 

 raatophoreu, die nur der Hydrotheca verbunden sind, meist auch mit 

 Corbulae), Plumularia Lam. p. p. (mit Nematophoren an Stamm und 

 Zweigen) 8 Sp. 



Subord. HI. Gymnochroa. Hydroida destitute of polypary. 



Fam. Hydridae. 



Hydra 4 Sp. 



Zur näheren Charakteristik der neuen Genera folgen hier die 

 von unserem Verf. aufgestellen Diagnosen: 



Gen. n. Hydranthea. Stem very short (rudimentary), ri- 

 sing at intervals from a network of anastomosing tubes, the whole 

 invested by a polypary; polypites borne singly on the stems, elon- 

 gate, fnsiform ; tentacles filiform, in a single circle surrounding a 

 low conical proboscis, each alternate tentacle bearing a prominent 

 tubercle composed of large beanchaped thread-cells; gonophores large, 

 borne on peduncles, with spring from the creeping stolon, not in- 

 vested by the polypary, containing fixed sporosacs. 



Gen. n. Lovenella. Stem simple or slightly branching, roo- 



