282 THE SCYPHOMEDUS.E OF THE SOUTHERN HEMISPHERE, 



Family. Toreumidaz. 



Discomedusa) without tentacles and without central mouth, with 

 four sub-genital cavities, and with ventral suction crisps on the 

 mouth-arms. 



Genus. Archirhiza, . 



Toreurnidse, with 8 simple mouth-arms, neither branched nor 

 furcated. Mouth-arms without vesicles and filaments with 16 

 radial canals and a ring canal, with 8 marginal bodies. 



Archirhiza aurosa. 



Haeckel, System der Medusen. Seite, 645. 



Umbrella flat, disc shaped, margin with 80 flaps, in every Octant 

 8 oval, pointed velar flaps between 2 broad triangular ocular flaps. 

 Mouth-arms 1| times as long as the Umbrella-radius, conic, simple, 

 with simple suction crisp. 



Size : Breadth of Umbrella, 50 mm. Height, 20 mm. 

 Locality : New Zealand. Weber. 



Species. Archirhiza primordialis. 



Haeckel, System der Medusen. Seite, 565, Tafel, XXXVI. 

 Figur. 1, 2. 



Umbrella slightly vaulted, hat-shaped or semi-spherical. 2-3 

 times as broad as high. Umbrella margin with 48 marginal flaps. 

 In every Octant four large pointed velar flaps and two small 

 ocular flaps. Mouth-arms about as long as the Umbrella-radius, 

 cylindrical, simple and undivided ; on the axial margin with simple 

 zig-zag shaped suction crisp. 



Size: Diameter of Umbrella, 40 mm. Height, 20 mm. 



Locality : Bass's Straits. Smith, 



Genus. Toreuma. 



Toreumida? with 8 feathered or trichotome branched mouth- 

 arms. The upper arm is continued in the adradial main branch of 

 the underarm. Numerous club-shaped vesicles between the arm- 

 crisps. 16 radial canals, 8 marginal bodies. 



