Natargesch. d. niedern Thiere währ. d. Jahre 1880 und 1881. 627 



Regent's-Park beobachtete Meduse beschrieben, ersterer 

 unter dem Namen Limnocodium n. g., Victoria n» sp., 

 letzterer als Craspedacaustes n. gen. Sowerbii n. sp., 

 Lankester zieht seinen Genusnamen zurück, will jedoch 

 den Speciesnamen beibehalten wissen; die Genusdiagnose 

 lautet: 



„Mouth quadrifid, with four perradial lobes; stomach long 

 and tubulär, projecting below the diso; disc flattened; radial 

 canals four terminating in the marginal canal; marginal canal 

 voluminous; centripetal canal absent; tentacles solid, in thre sets, 

 the horizont of the insertion of which are superimposed: a highest 

 set of four large perradial tentacles, a second tier of twenty-eight or 

 more medium-sized tentacles placed between these in four groups 

 of seven, a third tier of one hundred and ninety-two ore more small 

 tentacles placed in groups of six between the last; tentacle-rivets 

 connecting the roots of the tentacles with the marginal ring ure 

 connected with all the tentacles; otocysts placed along the line of 

 insertion of the velum-about ,80 — 100 in number: from 10 to 25 are 

 placed between successive perradial tentacles arranged in groups of 

 2 or three between the successive secondary tentacles; velar centri- 

 fugal canals are peculiar to this genus formed by the elongated 

 otocysts which pass into the velum and there and blindy; Ocelli are 

 raenting; gonads four oval sacs depending into the cavity of the 

 subumbrella from the four radial canals." 



Lankester macht weitere Mittheilungen über den Bau 

 der Tentakeln, des Nesselringes und der Otocysten, welch 

 letztere entodermale Bildungen aus dem Ringkanal sind; 

 die Entwicklung ist eine direkte. (G. J. All man in 

 Nature 27. Juni 1880; — on Limnocodium victoria, a 

 new hydroid medusa of fresh ivater in: Linn. Soc. 

 Journ. Zool. vol. XV. p. 131 — 137; Ray Lankester in 

 Nature 17. Juni 1880; Zool. Anz. 1880. p. 321-324; — 

 On Limnocodium (Craspedacaustes) Soiverbii, a 

 new Trachymedusa inhabiting fresh water in: Quart. 

 Journ. of micr. scienc. vol. XX. p. 351 — 371. with 2 pl.). 



Diese interessante Süsswassermeduse hat weitere Be- 

 obachtungen veranlasst; so berichtet (j. J. Romanes, dass 

 dieselbe gegen Seewasser ausserordentlich empfindlich ist, 

 während marine Medusen von Süsswasser weniger afficirt 

 werden {the physiol. of the Fresh-water Medusa in: 

 Nature XXJL p. 191.) 



