SCYPHOMEDUS.E OF THE AUSTRALIAN SEAS. 17 



IV. Ordo DISCAMEDUS^E. 



Haeckel, 1866. 



Scyphomeduspe with 8 16 or more marginal bodies (always at least in the 

 primary and secondary radii) ; 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 (ephyraflaps), and besides often numerous accessory 

 (velarflaps). Tentacles present or absent. Gastral cavity surrounded by a 

 circle of radial processes (8 12 16 or more), sometimes broad radial 

 pouches, sometimes narrow radial canals. Gonads 4, in the secondary radii, 

 representing folded bulges in the sub-umbrella of the sides of the gastral cavity, 

 from the entoderm of which they are developed (they rarely divide to form 

 eight bulges situated in the tertiary radii). Umbrella flattened orbicular. 



I. Sub-ordo CARMASTOMJ]. 



Haeckel, 1879. 



Discamedusre with simple quadrangular mouth tube, without mouth-arms, 

 with simple central mouth and with short solid tentacles. 



Familia EPHYEID^}. 



Haeckel, 1879. 



With broad radial pouches, without terminal branch canals, with simple 

 four cornered manubrium, without mouth-arms, with simple central 

 mouth. Mostly 16 broad radial pouches (8 ocular and 8 tentacular), 

 rarely 16 32. With these alternating as many short, solid tentacles. Mostly 

 16 (rarely 32 64) marginal flaps. Simple flap pouches present or absent. 

 Branched flap canals absent. Four or four pair of gonads in the secondary 

 radii situated in the sub-umbral wall. 



Genus EPHYRA. Haeckel, 1879. 



Ephyridse with 8 marginal bodies and 8 tentacles with 16 marginal flaps, 

 without flap pouches, and four horse-shoe-shaped gonads. 



EPHYRA PROMETOR, E. Haeckel. 

 Epliyra prometor, E. Haeckel. Das System der Medusen. Seite 482, tafel 



xxvii, figure 1, 2. 

 Ephyra proimtor, R. v. Lendenfeld. The Scyphomedusse of the Southern 



Hemisphere. 



Umbrella flat, bell-shaped, 1| times as broad as high. Marginal flaps oval, 

 about as long as broad, and ^ as long as the radius of the umbrella. Ten- 

 tacles pointed, twice as long as the marginal flaps. Four simple interradial 

 gastral filaments. Four gonads, horse-shoe-shaped, without flaps, and smooth. 

 Size. Breadth of umbrella, 8 mm. ; height of umbrella, 6 mm. Onto- 

 genesis unknown. 



Locality. Coast of Australia, Weber. 



