Microscopic Journal, and Structural Record . ing composed of tubular fibresand destitute of spicula ; these embrace the Sponges of Commerce, & Grants observations were limited principally to the Britishspecies of sponge having siliceous or calcareous spicula: the true Horny{Keratose) species not having up to that period been found on our in his British Miscellany has subsequently figured theSpongia pulchella obtained from the southern and western coasts ofEngland. Mr. B. then gives Dr. Flemings description of the genusSpongia— Porous, the cartilaginous skeleton simple, or de
Microscopic Journal, and Structural Record . ing composed of tubular fibresand destitute of spicula ; these embrace the Sponges of Commerce, & Grants observations were limited principally to the Britishspecies of sponge having siliceous or calcareous spicula: the true Horny{Keratose) species not having up to that period been found on our in his British Miscellany has subsequently figured theSpongia pulchella obtained from the southern and western coasts ofEngland. Mr. B. then gives Dr. Flemings description of the genusSpongia— Porous, the cartilaginous skeleton simple, or destitute ofearthy spicula; characters which will be presently shown from theinvestigations and researches of Mr. B. to be of little or no author was led to investigate this subject on account of having had avery extensive collection of sponges (amounting to forty species) presented * (Abstracted from the Paper read before the Microscopical Society of London, January 27, 1841.) t New Edinburgh Philosophical Journal, HORNY SPONGES OF COMMERCE. y to him by Rupert Kirk, Esq. obtained from Sydney, Australia, Manyof these specimens had all the appearance of being true Kerutose species,but which were afterwards, on examining them with a power of threehundred linear, found to possess these bodies imbedded, to a greater orless extent, in thesubstance of thefibre as representedin the annexed dia-gram ; * they arenot always to befound, at first sight,and in some casesnot until a patientsearch has beenmade. In some in-stances it is evenrequisite to burnsome quantity before the blow-pipe, and to subject the ash to theaction of dilute muriatic acid, previous to examining the residue. The results obtained from the examination of the Australian species,led Mr. Bowerbank to investigate the Keratose Sponges of Commerce,which he obtained previous to their being prepared as is customary bybleaching and cleaning. In commerce two kinds of sponges occur:—the Turkey, which is
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