1910.] FROM MEIIGUI AKCHIl'ELAGO. 801 



was infested; Thyroscyjihus viiiensis i\t nine; Seriularella quad- 

 ridens at four ; Corydendriiovi sessile, Eadendriwm attenuatihvi , 

 Ljjtocarpus pheeniceus each at two ; and JJiphasia digitalis and 

 Plumidaria setacea each at one. This result bears out the 

 impression gained from handling the collection, that Jdia 

 pristis is remarkabl}^ subject to infestation by extraneous Hydroid 

 colonies. Frequently its hydi-othecaj were all but obscured by 

 the attendant growths of Hydroids and Polyzoa, and this 

 although the state of the hydranths and of the ccenosarc generally, 

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



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

 a step towards a more intimate symbiosis ; of a canaliculated 

 ccenosarc in the stem and branches of Sertularella quadrideus ; 

 of the hitherto i;ndescribed gonosomes of Hcdeciuni simplex and 

 Thyroscj/phus regularis, are worthy of notice. 



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

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

 me for examination. 



List of Sjyecies. 



I. Gymnoblastea. 



Family Clavid^. 



*' C'orydendriuvi sessile, sp. n., p. 802. 



Family BougainvilliD/E. 



* Perigonimus repens Wright, p. 804. 



Family EuDENDRiDiE. 



*Eudendriuin attenuatum Allman (?), p. 804. 

 * ,, generalis Lendenfeld, p. 805. 



Family Corynid^. 



Cladocoryne haddoni Kirkpatrick, p. 805. 



Family Pennarid^. 



Pennaria disticha Goldfuss, var. ausiralis Bale, p. 806. 



II. CalyptoWastea. 



Family Halecid^, 



*Halecium simjylex Pictet, p. 807. 



„ tenellmn Hincks (?), p. 808. 



Family Campanularid^. 



Campanularia corrugata Thornely, p. 809. 



„ raridentata Alder, p. 809. 



Hehella ccdcarata A. Agassiz, p. 810. 



„ crateroides Ritchie, p. 810. 

 Thyroscyphus regularis Jiiderholm, p. 811. 

 „ vitiensis Marktanner, p. 812. 



