. Annali del Museo civico di storia naturale Giacomo Doria. Natural history. MEDITERRANEAN DEMOSPONGIAE 451 Holotype (a spicule slide), msng 47151. Description. (Fig. 2) The only specimen available was very small, encrusting, fleshy, dull yellowish-brown in life. It has been entirely used for a spicule preparation. Spicules. Tetralophous microcalthrops measuring [xm across. These spicules may be more or less regular, that is having four branching actines of about the same length. Even in this case the form is variable: the branches may be numerous or reduced and thickened, or the extre
. Annali del Museo civico di storia naturale Giacomo Doria. Natural history. MEDITERRANEAN DEMOSPONGIAE 451 Holotype (a spicule slide), msng 47151. Description. (Fig. 2) The only specimen available was very small, encrusting, fleshy, dull yellowish-brown in life. It has been entirely used for a spicule preparation. Spicules. Tetralophous microcalthrops measuring [xm across. These spicules may be more or less regular, that is having four branching actines of about the same length. Even in this case the form is variable: the branches may be numerous or reduced and thickened, or the extremity of the branches may be flattened, denticulated or bifid. A characteristic modification occurs in a large part of the spicules, to the eflFect that one or more actines become elongated and unbranched at their distal end. Almost invariably these elongated actines bear near their base one or two (sometimes three, but never more) strong pro- jections suggesting that this form derives from an overgrowth of one clad of the actine at the expense of the others. There are no 50 ^m Fig. 2 - Spicules of Corticium reductum sp. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Museo civico di storia naturale Giacomo Doria (Genoa, Italy). Genova : Stab. tipo-litografico P. Pellas Fu L.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
