. Zoologischer Anzeiger. Fig. 2. and over its large cen-. tral hole a ]( shapedpiece is attached, di-viding the hole intofour smaller ones. Thespokes are short, cy-lindrical, twelve innumber. To the outerrim and on the con-cave side of the wheel,twelve scale-like pro-cesses are attached,alternating with thetwelve spokes and turned towards the centre. These weel-shaped spi-cules were found in various stages of development. The [spicule which I found in the most rudimentary conditionwas a small rod with two horns at both the ends (fig. d). The distalend of each of these horns is next expanded in
. Zoologischer Anzeiger. Fig. 2. and over its large cen-. tral hole a ]( shapedpiece is attached, di-viding the hole intofour smaller ones. Thespokes are short, cy-lindrical, twelve innumber. To the outerrim and on the con-cave side of the wheel,twelve scale-like pro-cesses are attached,alternating with thetwelve spokes and turned towards the centre. These weel-shaped spi-cules were found in various stages of development. The [spicule which I found in the most rudimentary conditionwas a small rod with two horns at both the ends (fig. d). The distalend of each of these horns is next expanded into a small trapezoidalsheet (fig. e). The trapezoidal sheet is joined to the horn almost per-pendicularly at the middle point of its broader side. The upper andthe slanting sides of the trapezoid are gently concave. These sheetsare laterally expanded on its broader side and joined together ().At the point where two trapezoidal sheets unite, a tooth is a dodecagon with its sides a little curved inwards and with four 147 holes at its ce
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Keywords: ., bookcentury1800, bookdecade1870, bookidzoolog, booksubjectzoology
