616 THE AUSTRALIAN HYDROMEDUS^, 



65. GENUS CRYPTOHELIA. Milne Edwards et Haime. 



Pores in regular cyclo-systems. Styles absent, Gastro zooids 

 without tentacles. Gastropores with two chambers. Summits of 

 the cyclosystems covered by a lid. 



227. CRYPTOHELIA PUDICA. Milne Edwards et Haime. 



This species has been obtained from New Guinea and many 

 other places. It has been described by Milne Edwards and 

 Haime (1). 



IV. SUBORDER, TRACHOMEDUSINJE. 

 Von Lendenfeld, 1884. 



TRACHOMEDUS.E. GLAUS. 



HYDRO-MEDUSAE WHICH ARE MEDUS.E, AND ARE PROPA- 

 GATED SEXUALLY WITHOUT A CHANGE OF GENERATION AND 

 WITHOUT FORMING POLYPOID ZOOIDS. MEDUS.E WITH 

 ENTODERM A L ACAUSTIC CLUBS. 



17. FAMILY TRACHOMEDUSID^E. Yon Lendenfeld, 1884. 



TRACHOMEDUS^. Haeckel, 

 The Gonads are developed in the walls of the Radial Canals, 



1. SUB-FAMILY PETASIN.E. 

 PETASID^E. Haeckel. 

 With 4 Radial Canals, with long tube-shaped stomach. Acaustic 

 clubs free or in vesicles on the margin of the Umbrella. 

 No Australian species. 



(1) M. Edwards et Haime. Annates ctes Sciences Naturelles, 3 Ser. Tom. 

 XIII. , p. 93. 



