The Annals and magazine of natural history . 0/Walliel del known Species of Spongilla, 79 gilla instituted for the genus by Lamarck in 1816 (No. 5),has taken precedence of all the rest, whereby we now haveSpongilla jluviatilis and S. lacustris. It was not, however, until the improvements of the micro-scope ushered in an era of minuter observation that Spongillawas more particularly examined, when Dr. Grant (my kindfriend and able teacher) published his Observations in1826 (No. 6). After this, Meyen, in 1839, pointed out thatthe crust of the sphgerula or seed-like body (statoblast) wascompo
The Annals and magazine of natural history . 0/Walliel del known Species of Spongilla, 79 gilla instituted for the genus by Lamarck in 1816 (No. 5),has taken precedence of all the rest, whereby we now haveSpongilla jluviatilis and S. lacustris. It was not, however, until the improvements of the micro-scope ushered in an era of minuter observation that Spongillawas more particularly examined, when Dr. Grant (my kindfriend and able teacher) published his Observations in1826 (No. 6). After this, Meyen, in 1839, pointed out thatthe crust of the sphgerula or seed-like body (statoblast) wascomposed of vertically placed spicula l-250th to l-200th ofa millim. broad, at whose extremities, near the circumference,more or less toothed little disks are formed (PI. VI. , a, b)j and further that, besides the larger siliceous spiculawithin the substance of-the sponge, there exist more delicateones of l-16th to l-10th of a millim. long, having upontheir surface little points which elongate as their age in-creases (apud Johnston, No. |10, p
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