592 THE AUSTRALIAN HYDROMEDUS^, 



The Medusae bud on Polyp colonies which contain alimentary 

 Zooids, with scattered capitate tentacles. 



41. GENUS PTERONEMA. Haeckel. 



Cladoneminae with four simple Radial Canals, and with four 

 perradial tentacles, which are studded with secondary tentacles, or 

 with stalked nettle warts. A large brooding cavity above the 

 stomach. Four simple Gonads in the wall of the stomach. Mouth 

 with four lips. Exumbrella smooth, without nettle ribs. Polyp 

 colonies unknown. 



187. PTERONEMA DARWINII. Haeckel. 



This species was obtained in Australian waters, and has been 

 described by Haeckel (1.) 



188. PTERONEMA AMBIGUUM. Haeckel. 



This species was obtained at New Guinea (Waigiu), and described 

 by Lesson (2), as Microstoma ambiguum. Haeckel (3), combines 

 it with the foregoing species to form the Genus Pteronema. L. 

 Agassiz (4), names it Zanclea ambigua. 



10. FAMILY TUBULARID^E. Von Lendenfeld, 1884. 



The Meduste in this Family become rudimentary and remain 

 attached to the Polyps. The Zooids are all either alimentary 

 Polyps or Medusostyles, no Polypostyles are formed. The Zooids 

 are destitute of a Perisarc. 



(1) E. Haeckel, Has System der Medusen. Seite 101. 



(2) Lesson. Zoologie de la " Coquille," 1829. Tom II., p. 130. Acalephes, 

 1843, p. 295. 



(3) E. Haeckel. Das System der Medusen. Seite 102. 



(4) L. Agassiz. Monograph of Acalephre. Contrib. Nat. Hist , U.S.A. 

 Vol. IV., p. 344. 





