. Catalogue of the Blastoidea in the Geological Department of the British Museum (Natural History) : with an account of the morphology and systematic positionof the group, and a revision of the genera and species. British Museum (Natural History). Dept. of Geology; Blastoidea. Diagrams to illustrate the relation of the summit-plates to the interradials of the abactinal system. A. EUvacrinus elegans (modified from Hall). B. Platycriuus, sp. 3. Basals. 4. Radials. /. Intenadials. 0. Proximal summit-plates (Orals). bound the ambulacral openings, and the posterior proximal seems to be represented
. Catalogue of the Blastoidea in the Geological Department of the British Museum (Natural History) : with an account of the morphology and systematic positionof the group, and a revision of the genera and species. British Museum (Natural History). Dept. of Geology; Blastoidea. Diagrams to illustrate the relation of the summit-plates to the interradials of the abactinal system. A. EUvacrinus elegans (modified from Hall). B. Platycriuus, sp. 3. Basals. 4. Radials. /. Intenadials. 0. Proximal summit-plates (Orals). bound the ambulacral openings, and the posterior proximal seems to be represented by two plates which are separated by the anal tube. In the simplest form of Tlatycrinus the proximals rest directly on the primary interradials of the calyx (Fig. VI. B). But in other species, and in the Actinocrinidte, the structure of the i -â Vergleichende Entwickelungsgeschichte der Comatula ; Archiv f. Mikroskop. Anat. L876, Bd. xii. pp. 595, 621. â iii, Allagecrinus, the ltepresentativc of a new Family from the Carboniferous Limestone Scries ,i g ; Aim. & Mag. Nat. Hist. 1881, vol. vii. pp. 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 British Museum (Natural History). Dept. of Geology; Etheridge, Robert, 1846-1920; Carpenter, P. Herbert (Philip Herbert), 1852-1891. London : Printed by order of the Trustees
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