The Annals and magazine of natural history; zoology, botany, and geology . the upper portionor extremity of the filaments which re-mains free. The following are my rea-sons :— 1. I remarked in my two young speci-mens that the large spicules constitutingthe axis all terminate below at the samelevel, whilst their superior extremities re-main at different elevations. Now all theadult specimens present this same cha-racter : the filaments have their extremi-ties at the same level in the part enclosedin the sponge, whilst they show their freeextremities at different heights. I thinktherefore that t
The Annals and magazine of natural history; zoology, botany, and geology . the upper portionor extremity of the filaments which re-mains free. The following are my rea-sons :— 1. I remarked in my two young speci-mens that the large spicules constitutingthe axis all terminate below at the samelevel, whilst their superior extremities re-main at different elevations. Now all theadult specimens present this same cha-racter : the filaments have their extremi-ties at the same level in the part enclosedin the sponge, whilst they show their freeextremities at different heights. I thinktherefore that this sponge is inferior, andthat it corresponds to the sponge whichoccurs at the base of the young specimens.(As a matter of course, I regard the speci-men figured by Loven as a young Hyalo- 2. The following is another argument ^^* J^ centims.;• n r • • T diameter of them favour of my opmion. 1 possess a very sponge 17 ceutims, _ * [A translation of this memoir, with whicli we liave been kindly fur-nished by the author, will api)ear in our next Number.—Ed.]. Dr. J. V. Barboza clu Bocage on Hyalonema boreale. 37 curious example of Hyalonema lusitanicum^ in which there aretwo bundles of filaments to a single sponge, nearly as in theannexed drawing (p. 36). Now I can perfectly conceive that thetwo bases, originally distinct, have become confounded togetherwith increasing age; but I cannot understand this confusionif we are to assume that the natural position of Hyalonemais the reverse of that indicated in my sketch. I am now convinced that Hyalonema is a sponge. As tothe polypes [Palythoa fatua^ Schultze), I regard them as para-sites. I have several specimens oi Hyalonema with other para-sites : two are covered with an Antipatharian, three abso-lutely destitute of polypes and sponges, one embraced by thefoot of an Actinia of what seems to me a new species. It is aflesh-coloured Actinia of enormous size. I am still suffering from my recent illness. As soon as Iam a litt
Size: 1014px × 2466px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
