. Cassell's natural history. Animals; Animal behavior. THE STYLASTERS. 293 Tlie stomach and finger zooids contain muscular fibres, and the nematocysts or thread-cells have a spiral within them, with part of it jagged with a thorny part. Others have three barbs on tlie thread. The hard part of the Millepore is called the coenosteum. Unfortunately, the method of reproduction had not been ascertained by Prof. Moseley, to whom we owe the very exact description of these interesting things, which were formerly, before Agassiz saw the zooids, considered to be true tabulate Corals. Certainly it is onl
. Cassell's natural history. Animals; Animal behavior. THE STYLASTERS. 293 Tlie stomach and finger zooids contain muscular fibres, and the nematocysts or thread-cells have a spiral within them, with part of it jagged with a thorny part. Others have three barbs on tlie thread. The hard part of the Millepore is called the coenosteum. Unfortunately, the method of reproduction had not been ascertained by Prof. Moseley, to whom we owe the very exact description of these interesting things, which were formerly, before Agassiz saw the zooids, considered to be true tabulate Corals. Certainly it is only the part of the coenosteum above the uppermost tabula that is alive; all below was so once, and has died. FAMILY [WITH AMPULL.^. These have the pores with a style or calcareous spiny projection. Ampullai, or blister-like swellings on the surface, contain the male elements and large planulte. The Stylasters were named after small red-coloured, more or leris fan-sliaped, branching coral-like substances, on which are numerous groups of pores sur- rounding central cavities, having a projection at their â bottom. Until Moseley examined tliem, they were in- cluded in the Stony Corals, and the divisions between the pores were considered to be septa. He lias proved that the famUy, which comprises many genera, belongs to the same sub-order as the Millejiores. The hard part of the animal is composed of reticulations of tubes, and a gas- terozooid occupies the central pore space, and dactylozooids the surrounding circlet of pores. The hard part consists of carbonate of lime to a considerable extent, and is formed by the dejiosit of it in the substance of the outer skin, or ectoderm, of the canals or tubes. The canals open into the pores, which are really cylindrical pits, and at the bottom of each are a few large canals and their Some genera have a projection, or style, more or less brush-shaped, on the base of the floor of the cavity for the gasterozooid, and
Size: 1550px × 1611px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjecta, booksubjectanimals
