. Carnegie Institution of Washington publication. The Pluteus of Laganum sp. 133. 15 FIGS. 4 to 15.—Series showing development of plates and spines of the permanent skeleton of Laganum. Figs. 4, 5, 12 to 15 viewed from ventral surface. 6 to 11, from dorsal surface. b1, 62, 63, branches from each of the six primary rays, which by uniting with one another and with the wheel-like structure at their exterior ends, form 6 radiating plates in the base of the spines; c, 6 branches of the primary rods which form the cup-like basal portion of the spine; p, plate; ps, portion forming small secondary pla
. Carnegie Institution of Washington publication. The Pluteus of Laganum sp. 133. 15 FIGS. 4 to 15.—Series showing development of plates and spines of the permanent skeleton of Laganum. Figs. 4, 5, 12 to 15 viewed from ventral surface. 6 to 11, from dorsal surface. b1, 62, 63, branches from each of the six primary rays, which by uniting with one another and with the wheel-like structure at their exterior ends, form 6 radiating plates in the base of the spines; c, 6 branches of the primary rods which form the cup-like basal portion of the spine; p, plate; ps, portion forming small secondary plate which lies between the primary one and the spine; w, portion forming wheel-like base of the spine. Figs. 4-10, X466. Figs. 13-15, X350. FIG. 16.—Permanent plates and spines viewed from the oral surface, showing their characteristic arrangement around the anlage of the adult mouth, m. a. p., adult plate; , adult spine. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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