. The microscope and its revelations. B. Fin. (>>-].—A, section through Ilnilcrllin r< nl iJtiLriiin, var. connexida, taken at rightangles t,ci the surface, to show the- arrangement of the parts of a. sponge : /i, poreson the snrtiiee |e:nlin;j to if, tlie inlialiinl canals, then to the flagellated chambers,/<•, Mild thence to the exhalant CMluils, /f, to o, the oseiila, in the derniMl I}, nion- highly magnified view of (lie internal portion ichoanosome) ofAxiliella paradoXd • ) : me, so-called mesodennal cells. Other letters MS in A.(After Ridley and Bendy

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. The microscope and its revelations. B. Fin. (>>-].—A, section through Ilnilcrllin r< nl iJtiLriiin, var. connexida, taken at rightangles t,ci the surface, to show the- arrangement of the parts of a. sponge : /i, poreson the snrtiiee |e:nlin;j to if, tlie inlialiinl canals, then to the flagellated chambers,/<•, Mild thence to the exhalant CMluils, /f, to o, the oseiila, in the derniMl I}, nion- highly magnified view of (lie internal portion ichoanosome) ofAxiliella paradoXd • ) : me, so-called mesodennal cells. Other letters MS in A.(After Ridley and Bendy.) SPONGE-SPICULES 859 ...It vals, giving them a jointed The more recent authoritieson Sponges, such as Professor Hollas and Messrs. Ridley and Dendy,have recognised that in the present state of our knowledge the spiculeswhich are ordinarily found in silicious Sponges belong to one of twogroups, which, as they differ considerably in size, may be calledmegascleres (or, more correctly, megaloscleres) and microscleres. I

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901