BY R. VON LENDENFELD, PH.D. 583 



177. SARSIA RADIATA. nov. sp. 



Tlie Medusa. 



Plate XX., fig. 31. 



Umbrella semi-ovate, slightly higher than, broad. Manubrium 

 cylindrical, half as long as the Umbrella, spindle-shaped containing 

 deep brown Entoderm and covered from the Gonade. Tentacles 

 a little longer than the Ocellar bulbs, which are half as thick as 

 the Manubrium, globular. Medusae do not multiply by budding. 



Colour : Entoderm of Manubrium and Ocellar bulbs deep brown. 

 Medusa? otherwise colourless. 



Size: 3 mm. high, and 2-5 mm. broad. 

 The Polyp. 

 Plate XX., fig. 32. 



From a creeping rarely branched Hydrorhiza, which forms a net- 

 work of anastomosing threads, the Hydrocauli arise. At the end 

 of each, one Polyp is situated ; they are unbranched. The Perisarc 

 which invests Hydrorhiza and Krodrocaulus terminates below 

 each Hydranth with an oblique elliptical margin. 



The Hydranth possesses a muscle which acts as a flexor at this 

 point, by the means of which it is enabled to bend down and shut 

 up as it were like a penknife. 



The Hydranths possess 6-8 verticils of four tentacles which are 

 situated in four adradial Meridians. They are spindle shaped. 

 Those producing Medusa? are shorter and stouter than the others. 



The Proboscis is large and often extended, and then shows a 

 richly folded Entoderm on its inner surface. 



Colour : Entoderm, particularly of the central wide part of the 

 gastral cavity, intensely brown, Persiarc light brownish yellow. 

 The other parts of the animal colourless, 



Size : Height of Polyps, 3-5 mm. 



