BY R. YON LENDENFELD, PH.D. 001 



Edwards (1) and L. Agassiz (2), the Aequarea thalassina of de 

 Lamarck (3) and the Cuviera euchroma of Leseur (4), are 

 identical. Haeckel (5) has placed this species in his genus 

 Cladocanna 



200. CLADOCANNA POLYCLADA. Haeckel. 



This species has been obtained at New Guinea and described by 

 Haeckel (6). 



III. SUB-FAMILY EUCOPIN.E. 



EUCOPID.E. Gegenbaur. 



LeptomedusEe, with marginal -vesicles, four simple unbranched 

 Radial Canals. 



Polyp colonies mostly consisting of a creeping Hydrorhiza from 

 which either simple Hydrocauli arise or high more or less branched 

 stems. Terminally the Hydrocauli extend to form chitinous cups 

 around the alimentary Zooids. 



The Polypostyles are invested by a chitinous Gonangium, which 

 has a flattened appearance. 



Sometimes (Octorchis.) Claus (7.) The Polype colonies consist 

 of Gymnoblastic Hydranths and the Medusa? bud on the ordinary 

 Hydranths laterally (Claus I.e.) 



Should, as is highly probable, more Hydromedusee be discovered 

 the Medusa of which were Eucopida?, the Hydranth and Medusoid 

 buds of which were to possess characters of our Anthomedusida?, 

 it would be necessary to make a new family or sub-order for these 

 forms. At present we are not able to do this because our 

 knowledge of the Ontogenesis of the Eucopinae is so very limited. 



(1) Milne Edwards. Cuvier regne animal illustre, Planche 53, fig. 3. 



(2) L. Agassiz. Monograph of Acalephes. Contrib. Nat Hist., U.S.A., 

 Vol. IV., p. 345. 



(3) De Lamarck. Hist. Nat. des animaux sans Vertebres, 1817. Tom 

 II., p. 497. 



(4) Leseur. Recuiel das Planches (inedites) des Meduses, 1839. Planche 

 II., fig. 2. 



(5) E. Haeckel. Das System der Medusen. Seite 160. 



(6) E. Haeckel. Das System der Medusen. Seite 161. 



(7) G. Claus. Beitriige zur Kenntniss der Geryonopsiden und Eucopiden 

 Entwicklung. Arbeiteu aus dem Zoologischen Institute der Universitat 

 Wien. Band IV. Seite S9. 



