Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 686
which we find in the compara-tively small division in which they are composed of carbonate oflime. The long needle-like spicules (Fig. 353), which are extremelyabundant in several Sponges, lying close together in bundles, aresometimes straight, sometimes slightly curved; they are sometimespointed… … Siliceous Spicules of Pachymatisma. to form hooks (Fig. 488, n). When the spicules project from thehorny framework, they are usually somewhat conical in form,and their surface is often beset with little spines, Fig. 353. arranged at regular in-tervals, giving them ajointed appearance (Fig.352, a).…
Microscopy · Biology
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