By Frederick W. Harrison
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Extra resources for Aspects of Sponge Biology
In micrographs of mature sponge silica40 ASPECTS OF SPONGE BIOLOGY blasts, even with the Golgi apparatus showing, I have not seen the typical silicon electron density, but I have never been lucky enough to have an immature silicablast in the section. If Lesquereusia spiralis can be used as any refer ence, we can expect Golgi involvement in elaboration of sili con in sponges. SIMPSON: There is, however, a major area of difference among the ameboid forms, the algae, and the diatoms. In sponges there is a whole membrane system which develops, the silicalemma.
The very young microscleres of Spongilla lacustris normally have a small central swelling. Occasion ally immature megascleres do also. Some microscleres, even when they are a normal 120 to 130 y in length, may show a small swelling. This probably indicates that in the microsclere, in terms of balance, the membrane is slightly ahead of the filament. There is no place for the silicon to go in a smooth geometric pattern, so it piles up to some extent. POIRRIER: It is a beautiful explanation for what I have seen—even with the infolding.
The West Indian haplosclerid "Callyspongia" plicifera varies from pink to purple, orange, and blue. Its color in life is made even more remarkable by its iridescence or luminescence, a property which is absent in other West Indian sponges of this genus. Haliclona aquaeductus is also strikingly polychromous. The color variants reported by Italian authors for populations of the Mediter ranean (greyish and yellowish white, drab, pink, brownish orange) complement those which I observed in the Bahamas (pinkish lavender to purple, drab, olive, greyish).
Aspects of Sponge Biology by Frederick W. Harrison