. Annali del Museo civico di storia naturale Giacomo Doria. Natural history. WEST INDIAN DEMOSPONGIAE 127 now of a firm and inelastic skeleton violet coloured (); the soft part has separated and deposited at the bottom of the jar. The skeleton is reticulated, devoid of ectosomal differentiation, with meshes up to 6 mm wide. The main fibres are irregular, flattened, and may be 3 or 4 mm wide where they join each other. Reaching the surface, they di- vide in several short branchlets. The secondary fibres are cylindrical. The fibres consist of pale amber-coloured spongin in which abundant s
. Annali del Museo civico di storia naturale Giacomo Doria. Natural history. WEST INDIAN DEMOSPONGIAE 127 now of a firm and inelastic skeleton violet coloured (); the soft part has separated and deposited at the bottom of the jar. The skeleton is reticulated, devoid of ectosomal differentiation, with meshes up to 6 mm wide. The main fibres are irregular, flattened, and may be 3 or 4 mm wide where they join each other. Reaching the surface, they di- vide in several short branchlets. The secondary fibres are cylindrical. The fibres consist of pale amber-coloured spongin in which abundant subtylostyles are embedded. These may form thick parallel rows or, in the flattened parts of the fibres, appear in tracts or in confusion. Spicules: 1) Subtylostyles straight, isodiametric, measuring 250- 280 X [i,m. The point is blunt, often strongylote. 2) Sigmas C- shaped, with a chord of 65-90 [im, [xm thick. 3) Anisochelas palmate measuring 16-23 fxm. 4) Raphides sinuous (raphidotoxas) measuring about 100 [im, rare. Mycale whitfieldi sp. n. (Fig. 50) Hircinia purpurea: Whitfield, 1901: 49 not Hircinia purpurea Hyatt, 1877: 550 Not present in this collection. I have been able to examine a fragment of Whitfield's specimen kept at the American Museum of Natural History. It is in the dry state and has shrunk to a fibrous reticulated skeleton on which little flesh is attached. The fibres are made of amber to reddish-brown stratified spongin embedding a variable number (generally scarce) of subtylo-. Fig. 50 20 [im. Spicules of Hircinia purpurea, Whitfield, 1901. Scale a: 50 [xm, scale b:. 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
