THE SCYPHOMEDUS^E OF THE SOUTHERN 

 HEMISPHERE. 



By R. von Lendenfeld, Ph.D. 



Part III. — Conclusion. 



IV. ORDO. DlSCOMEDUS^E. 



Discomedusce. Haeckel, 1866. 



Phanerocarpce. Pschscholtz, 1829. 



Discophorce. Claus, 1879. (non Eschscholtz, 1829. non 

 Agassiz, 1862.) 



SemaeostomecB et Rhizostomece. L. Agassiz, 1862. 



Acraspedge with 8-16 or more marginal bodies (always 4 

 perradial and 4 interradial, besides these sometimes several 

 accessory) ; in each marginal body an acoustic vesicle with 

 Entodermal Otolith-pouch, and often at the same time an eye. 

 Marginal flaps, always 8 pairs primary (Ephyra-flaps), and 

 besides often numerous accessory, (Velar-flaps). Tentacles some- 

 times present, sometimes wanting. Gastral cavity surrounded by 

 a circle of radial processes (8-16-32 or more), sometimes broad 

 radial-pouches, sometimes narrow radial canals. Gonads 4, inter- 

 radial folded bulges in the Sub- umbrella of the sides of the Gastral 

 cavity, from the Entoderm of which they are developed (they 

 disintegrate seldom into 8 adradrial bulges). They are sometimes 

 pouch-shaped, sometimes protruding inwards into the central 

 Gastral cavity, sometimes protruding outwards in hernia-shape 

 into the Umbrella cavity. 



Umbrella flattened, orbicular. The ancestral form of all 

 Discomedusaj is the Octomeral Ephyra. 



