Mr. A. Dendj on a neio Species q/'Claclorhlza. 279 



these animals also, because from its organization we may 

 suppose that Polyparium ambulans likewise reproduces 

 asexually, but, notwithstanding its considerable size, no 

 sexual products are found in it. 



From all this therefore I come to the conclusion that Poli/- 

 parium ambulans is an astomatous individual animal, sepa- 

 rated by external influences from a single-mouthed Actinia 

 furnished with widely open degenerated tentacles, and add the 

 further supposition that this animal has grown by paranomal 

 development under shallow-water conditions of life into the 

 band-like form, and as such may be capable of asexual 

 reproduction, perhaps by fission. 



This fabric of speculations may perhaps collapse as soon 

 as the animal which has given occasion for it shall be more 

 exactly known than at present by further investigations, in 

 which, amongst other things, the terminal chambers of the 

 body will have to be examined. My purpose is attained if 

 by these pages the attention of naturalists is directed not only 

 to the animal discovered by Korotneff, but also to the pro- 

 cesses of what I have denominated paranomal development, 

 which call for further investigation. 



XXXIV. — On a remarkahle neio 8j)ecies of Cladorhiza ob- 

 tained by H.M. 8. ' Challenger.'' By Arthur Dendy, B.Sc, 

 F.L.S., Assistant in the Zoological Department of the 

 British Museum. 



[Plate XV.] 



In returning the collection of Hexactinellid Sponges dredged 

 by H.M.S. ' Challenger ' to the Natural- History Museum, 

 after the completion of his examination of the group, Pro- 

 fessor F. E. Schulze also returned a very remarkable little 

 Monaxonid sponge, which had been accidentally sent to him 

 with the others. As the specimen in question did not come 

 into my possession until after the completion of the Report 

 on the ' Challenger ' Monaxonida by Mr. Ridley and myself, 

 I have thought it desirable to give an account of it in this 

 place. It is a new and very well-marked species of the 

 genus Cladorhiza, M. Sars ; and I propose for it the name 

 Cladorhiza pentacrinus, owing to the resemblance which it 

 bears to the Pentacrinoid law a o? A ntedon. The specimen 

 was, unfortunately, received in the dry condition. 



