608 THE AUSTRALIAN HYDROMEDUSjE, 



The Medusa differs as far as its histology is concerned, not 

 essentially from other Craspedotse. 



The ova are Entoclermal, the sperma is Ectodermal. The 

 formation of the Medusa bud led the author to consider the 

 Umbrella cavity as a ccelom. 



207. EUCOPELLA CAMPANULARIA. Von Lendcnfeld. 



This species is very abundant in Port Phillip and other places 

 ou the Coast of Victoria, and has been described by Von Lenden- 

 feld (1.) 



V. SUB-FAMILY AEQUORIN^E. 



AEQUORID^. Eschscholtz. 



W ith marginal vesicles and numerous (at least 8) often branched 

 Radial Canals 



The Polype colonies are known of a single species only (Zygo- 

 dactyla vitrina. L. Agassiz ) 



The Hydranth is characterized by a thin membrane, which joins 

 the tentacles at their base. The Hydranths are invested by a 

 Perisarc with a lid consisting of numerous pieces. 



54. GENUS ZYGOCANNA. Haeckel. 



Aequoridse with numerous 16 or more dichotome Radial Canals. 

 To every branch a Gonad is attached, which may l>e simple or 

 bilamellar. Stomach without stalk, broad and long. Margin of 

 mouth split into numei-ous folded mouth flaps. Polype colonies 

 unknown. 



208. ZYGOCANNA COSTATA. Haeckel. 



This species was obtained on the Coast of New Guinea and 

 described by Haeckel (1.) 



(1) Von Lendcnfeld. Encopella Campanularia. Zeitschrift fur wissen- 

 schaftliche Zoologie. Band XXXVIII. Seite 497. 

 (i) E. Haeckel. Das System der Medusen. Seite 214. 



