(mit Ausschluss der Siphonophora) für 1901—1903. 505 



Sub-family 1. Pteronemidae. 



Cladonemidae with unbranched tentacles armed with cnidopbors along tbe 

 abaxial side. Radial canals 4, simple or forked. 



Group «. Cnidopbors stalked and knob-shaped. Radial canals simple. Oral 

 tentacles absent. 



Pteronema Haeckel: „Scheitelhöhle" pre?ent as a brood pouch; Tentacles 

 4; cnidacts on exumbrella absent. 



Zanclea Gegenbaur. „Scheitelhöhle" absent as a brood pouch; Tentacles 4; 

 cnidacts on exumbrella 4. 



Mnestra Krohn. „Scheitelhöhle" absent as a brood pouch; Tentacles 4—0; 

 cnidacts on exumbrella 4; sessile on Phyllirhoe. 



Gemmaria Mc Crady. „Scheitelhöhle" absent as a brood pouch. Tentacles 

 2; cnidacts on exumbrella absent, but 4 nematocyst tubes lie beneatb the surface 

 of the exumbrella. 



Group ß. Cnidopbors filiform. Radial canals forked. Oral tentacles 

 present. 



Ctenaria Haeckel. Tentacles 2; cnidacts on exumbrella 8; tentacular 

 Pouches 2; „Scheitelhöhle" present. 



Subfamily 2. Dendronemidae. 



Cladonemidae with branched tentacles; the branches turued towards the 

 mouth (axial) end in suckers, those turned away from the mouth (abaxial) end 

 in batteries of nematocysts. 



Group «. Axial and abaxial branches of tentacles are simple and un- 

 divided. Radial canal simple. Oral tentacles absent. 



Eleutheria Quatrefages. Scheitelhöhle, of peculiar structure, present; 

 cnidacts absent. Eleutheria Vallenüni n. sp. Browne (2) p. 279, keine f. Nur 

 1 Expl. and it was found on a frond of Macrocystis, commonly called kelp. 



Group ß. Abaxial branches of tentacles branch dichotomously. Radial 

 canals forked (usually). Oral tentacles present. 



Cladonema Dujardin. Oral tentacles 4, simple; Scheitelhöhle absent; 

 Cnidacts absent. 



Dendronema Haeckel. Oral tentacles in 4 bundles, branched; Scheitelhöhle 

 present; Cnidacts absent. 



Mesonema victoria n. sp. Murbach u. Shearer p. 72, keine f. Collected in 

 considerable numbers at the entrance of Victoria Harbour, and in Puget 

 Sound. 



R. T. Günther (1) p. 57—58 schliesst seine Erörterungen über die Klassi- 

 fikation der Cladonemidae mit einer lebhaften Zustimmung zu Vanhöffens Klassi- 

 fikation der gesammten Anthomedusen-Ordnung, der auch Delage u. Herouard 

 gefolgt seien. But I cannot agree with the former in regarding the Clado- 

 nemidae as a subgroup (Cladonemata) of the Pycnomerinthia or Oceanidae which 

 have solid tentacles almost filled with large endoderm cells. Meine Unter- 

 suchungen an Mnestra, Haeckels Zeichnungen von Gemmaria und Dendronema 

 und Allmans Beschreibung der Cladonema beweisen, dass diese Formen Ten- 

 takel des coelomerinthic type haben i. e. contractile hol low tentacles with 

 endodermal cells surrounding the lumen. On this and other grounds it would 

 seem advisable to retaiu the Cladonemidae in a position of importance equal 



