Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 549
Tf rays are mucli longer, and scarcely any central nucleus can besaid to exist. The varieties in the form of Sponge-spiculesare, in fact, almost endless ; and a single sponge often pre-sents two or more (as shown in Eig. 219), the stellate spicules usually occurringFig. 219. eitherin the inter-… … Siliceous Spictiles oi Fachymatisma. uniform size, which are found imbedded in the horny fibre. The spicules of Sponges cannot be considered, lilve the raphides of Plants (§ 230), simply as deposits of mineralmatter in a crystalline state. Eor the forms of many of themare such as no mere…
Microscopy
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