612 THE AUSTRALIAN HYDROMEDUSjE, 



I. SUB-FAMILY CYT^IN.E 



CYT.EID2E. Haeckel. 



Producing free Medusse, which bud from the Hydrorhiza. No 

 Australian species. 



II. SUBFAMILY HYDRACTININ^, 



Medusse bud on Polypostyles, remain sessile and become rudi- 

 mentary (or immersed in the basal plate ?) 



59. GENUS CERATELLA. Gray (?) 



Hydrophyton irregularly dichotomous. Perisarc dark brown. 

 Hydranths, Polypostyles, and Medusoid buds uuknown. The 

 detailed description of the skeleton by Gray ^1) is worthless. 



215. CERATELLA FUSCA. Grny. 



Gray (2) and Carter (3) mention this species, which was 

 obtained from Bondi, near Sydney, in all probability washed up 

 on the sands. 



60. GENUS DEHITELLA. Gray. (?) 



Hydrophyton dichotomous, Perisarc dark brown. Perisarc of 

 Spiral zooids vertical on the stem and branches. (?) Differs from 

 Ceratella by the equal distribution of the " tufts of spicules." 



216. DEHITELLA ATBORUBENS. Gray. 



It is doubtful whether this species described by Gray (4) and 



Carter (5) is Australian. 



(1) Gray. Proc. Zool. Soc. of London, November, 1SG8. 



(2) Gray. Proceedings of the Zoological Society of London, November, 

 1S68. 



(3) Carter. Annals and Magazine of Natural History, January 1S73. 



(4) Gray. Pooc. Zool. Soc, London, November, 1S68. 



(5) Carter. Ann. Mag. Nat. Hist., January, 1873. 



