476 Scientific Proceedings, Royal Dublin Society. 



colour is purplish-brown, or red, and the length 32 mm. - to 46 mm. 

 With the exception of two specimens of very large size found 

 buried in the gravel, at low water-mark, at Eastport, Maine 

 (Verrill, 1873), this form is only known as parasitic in the lip-folds 

 of Cyanea arctica, from Cape Cod to the Bay of Fundy. 



Southern Ocean. 



Actinia davits, . . Quoy et Gaimard, 1833, Voyage de V As- 



trolabe, p. 150, pi. x., figs. 6, 11. 



Iluanthos ,, . . Milne Edwards, 1857, Hist. Nat. desCoral- 



liaires, i., p. 284. 



Philomedusa clavus, . . Andres, 1883, Le Attinie, Atti. Ace. Rom. 



(3 a) xiv. [Fauna u. Fl. d. Golfes v. 

 Neapel(im±),v- 114.] 



Halcampa ,, . . R. Hertwig, 1882, Actiniaria, " Challenger" 



Reports, p. 92. 



Quoy and Gaimard found several specimens of this Halcampa 

 entangled {engages) in the tentacles of a medusa. It was 7-8 

 lines long in its greatest extension, and only three when con- 

 tracted ; translucid white in colour ; 12 short tentacles. They 

 obtained it in Bass' Straits, Australia, lat. 38° S. 



E. Hertwig identifies an Halcampa dredged by the Challenger 

 at Kerguelen (25-120 fathoms) as this species. 



It is interesting to observe that certain (at least) of the 

 members of the three families, Edwardsidse, Halcampidee, and 

 Siphonactinidse, pass through a stage during which they are para- 

 sitic on Medusse or Ctenophores. There is now a good deal of 

 evidence in favour of the view, that the Edwardsidse and Halcam- 

 pidee are more closely related than was formerly thought to be the 

 case ; and, so far as my investigations on Peachia have gone, I am 

 led to believe that the Siphonactinidse are closely related to the 

 latter. Be this as it may, the genus Philomedusa must now be 

 discarded. 



As before mentioned, in 1885 I found one or two specimens of 

 the larval Halcampa in Dublin Bay, and again in 1886, in July of 

 that year, I also found a specimen oif the coast of Cork. They 



