. Bulletin. Natural history; Natuurlijke historie. SYSTEMATICS 43 Spicules. The subtylostyles can be readily divided into two categories by their thick- ness, (a) The echinators and some of the scattered megascleres are stout, with dimensions of 72-702 X 5-20 /x. A slight but definite constriction separates the rounded head from the shaft. The longer spicules are usually curved toward the basal end. The shorter spicules are usually straight and frequently have roughened heads. A very few stout subtylostyles exhibit a slight tendency toward shaft spination. The spines, when present,. I I. Pleas
. Bulletin. Natural history; Natuurlijke historie. SYSTEMATICS 43 Spicules. The subtylostyles can be readily divided into two categories by their thick- ness, (a) The echinators and some of the scattered megascleres are stout, with dimensions of 72-702 X 5-20 /x. A slight but definite constriction separates the rounded head from the shaft. The longer spicules are usually curved toward the basal end. The shorter spicules are usually straight and frequently have roughened heads. A very few stout subtylostyles exhibit a slight tendency toward shaft spination. The spines, when present,. I I. 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 Peabody Museum of Natural History. New Haven : The Museum
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