1910.] FUOM MEUGUI ARCniPELAGO. 801 



was infested ; Tht/rosoyphns vitieiisis at nine ; Serttdarella quad- 

 ridens at foui' ; Corydendriam sessile, Eadetulrium atlenuatiim, 

 Lytocarpus phceniceiis each at two ; and Diphasifi digitalis and 

 Plumidaria setacea each at one. This result bears out the 

 impression gained from liaudling the collection, that Idia 

 prisiis is remarkal)!y subject to infestation liy extraneous Hydroid 

 colonies. Frequently its hydrothecic were all but obscured by 

 the attendant growths of Hydroids and Polyzoa, and this 

 although the state of the hydranths and of the cienosarc general]}', 

 indicated that the host colony was in a perfectly healthy condition. 



The occurrence, in Lafoea veausta (?), of what appears to be 

 a step towards a more intimate symbiosis ; of a canaliculated 

 ccenosarc in the stem and blanches of Sertularella quadrideus ; 

 of the liitherto undescribed gonosomes of Haleciavi simplex and 

 Tlirp-oscyphtis regularis, are worthy of notice. 



Finally, I would express my thanks to Dr. R. N. Rudmose- 

 Brown and Mr. J. J. Simpson for entrusting this collection to 

 me for examination. 



List of Species. 



I. Gymnohlastea. 



Family Clavid.b. 



* Corydendriuin sessile, sp. n., p. 802. 



Family Bougaixvillidj;. 



* Ferigo7iimus repens Wright, p. 804. 



Family Eudendhid^. 



* Evdendriuvi attemmtum Allman (?), p. 804. 

 * „ generalis Lendenfeld, p. 805. 



Family Corynid^. 



Cladocoryne haddoni Kirkpatrick, p. 805. 



Family Pennarid^. 



Pennaria disticha Goldfuss, var. australis Bale, p. 80C. 



II. Calyptoblastea. 



Family IlALECiu.i:. 



*Ualecium simplex Pictet, p. 807. 



„ tenellum Hiucks (?), p. 808. 



Family Campaxularid.*. 



Campa/nularia corrugata Thorncly, p. 809. 



„ raridentata Alder, p. 809. 



Eehdla calcarata A. Aga.ssiz, p. 810. 



„ crateroides Ritchie, p. 810. 

 Thyroscyphus regularis Jiiderholm, p. 81 1. 

 „ vitiensis Slarktanner, p. 812. 



[3] 



