. Annali del Museo civico di storia naturale Giacomo Doria. Natural history. MEDITERRANEAN DEMOSPONGIAE 491 form, straight or slightly curved, mostly showing a vesicle in the tyle, size 210-490 x 7-10 yun. 3) Tylostyles gently curved, size 80-120 x am. Polymastia sp. A Occurrence. Banc du Magaud, depth 140-160 m, detrital, dredge, 19 May 1970. Description. (Figg. 22, 23) The specimen, entirely used for a spicule preparation, was a roundish to encrusting mass on a pebble, about 7 mm in diameter, bearing a cylindrical process about 5 mm long and 1 mm thick. Spicules. 1) S
. Annali del Museo civico di storia naturale Giacomo Doria. Natural history. MEDITERRANEAN DEMOSPONGIAE 491 form, straight or slightly curved, mostly showing a vesicle in the tyle, size 210-490 x 7-10 yun. 3) Tylostyles gently curved, size 80-120 x am. Polymastia sp. A Occurrence. Banc du Magaud, depth 140-160 m, detrital, dredge, 19 May 1970. Description. (Figg. 22, 23) The specimen, entirely used for a spicule preparation, was a roundish to encrusting mass on a pebble, about 7 mm in diameter, bearing a cylindrical process about 5 mm long and 1 mm thick. Spicules. 1) Subtylostyles to strongyloxeas straight, fusiform, size 600-800 X [xm. 2) Tylostyles fusiform, generally with well- formed tyle, but sometimes modified toward strongyloxeas, straight or gently curved at the first third of their length, size 220-400 x 7-12 [im. 3) Styles to subtylostyles to tylostyles gently curved, size 90-150 x 3 [xm. Remarks. The main diflFerence of this spiculation from that of Polymastia polytylota Vacelet consists in the absence of Fig. 22 ? Polymastia sp. A. Specimen (in spirit;. Scale: 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
