588 THE AUSTRALIAN HYDROMEDUS.E, 



182. TURRITOPSIS PLEUROSTOMA. Haeckel. 



This species was obtained from De Witt's Land, North-west 

 Coast of Australia, and described by P£ron et Leseur (1), as 

 Melicerta pleurostoma. Haeckel (2) refers it to the Genus Turri- 

 topsis. 



183. TURRITOPSIS LATA. nov. sp. 



Plate XXII, fig. 36. 



Umbrella broad, cylindrical, with a conic roof on the vortex, 

 scarcely higher than broad. Stomach a spindle-shaped tube, about 

 § as long as the Umbrella is high. Gonads large; each having the 

 shape of a quarter sphere, they altogether appear as a sphere round 

 the stomach tube like a time-ball on a staff. Their surface is 

 uneven, much and irregularly folded. Mouth flaps small, I of the 

 length of the Manubrium, lancet-shaped and slightly recurved. 

 Ocellar bulbs large, touching each other in the adult animal ; to 

 every one there is a tentacle. Tentacles about twice as long as the 

 Umbrella, very numerous. Four in the youngest Medusae I 

 obtained, and 60-130 in the largest. 



Colour : Medusa colourless. Gonads and Entoderm of Ocellar 

 bulbs intensely brown. Ocella with red pigment. 



Size : Umbrella of the largest Medusae 3 - 5 mm. high and 3 mm. 

 broad. 



Ontogenesis and Polyp colonies unknown. 



Locality ; Port Jackson. 



Note. — This Medusa is by far the most common Craspedota in 

 the harbour. Sometimes I have endeavoured to estimate the 

 number per cubic meter of water. My surface net measured 26 cm. 

 across, surface of orifice therefore 530 a cm. ; pulled for a length 

 of 50 meters (dropped from boat and hauled in from land) it 

 should have caught the Medusae contained in 5,000 x 530 cm. 



(1) Ptron et Leseur. Tableau des Med uses, 1S09, p. 353. 



(2) E. Haeckel. System der Medusen. Seite 67. 



