Bulletins of American paleontology. Cambrian Trilobites, South Dakota 253. Text-figure 1. A growth series of Coosia albcrtensis Resser. A. Anapro- taspis, X 50; B, C. Two metaprotaspides, X 50, X 48;

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Download this stock image: . Bulletins of American paleontology. Cambrian Trilobites, South Dakota 253. Text-figure 1. A growth series of Coosia albcrtensis Resser. A. Anapro- taspis, X 50; B, C. Two metaprotaspides, X 50, X 48; D, E. Small and large paraprotaspides, X 40, X 38; F. Small early meraspis, X 13; G. Large early meraspid cranidium, X 8; H. J. Two late meraspid cranidia, X 13, X 19; I. Immature librigena, X 6; K. Hypostoma, X 10; L, M. Small and large holaspid cranidia, X 2.4, X 1-7. (All drawings were made from photographs.). Please note that these images are extracted from scanned page images that may have - RG9GN2 from Alamy's library of millions of high resolution stock photos, illustrations and vectors.

Bulletins of American paleontology. Cambrian Trilobites, South Dakota 259 The metaprotaspid stage differs from the anaprotaspid in hav- ing the axial lobe well delimited by a dorsal furrow and the presence