. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 24 G. HENDLER. Figure 2. Amphiura ttimpsonii: growth stages of jaw and oral papillae. Stages numbered according to Table I. (A) Stage 2 (brooded); mm dd. 4 AS. (B) Stage 4 (brooded); mm dd. 10 AS; detail of jaw apex, double arrowhead indicates indentation on dental plate at attachment site for (missing) infradental papilla. (C) Stage 4 (free-living); mm dd, 10 AS; opposing arrowheads indicate suture between proximal and distal oral plates of the jaw (sensu Hendler, 1978). (D) Stages 7-8; mmdd, 19 AS; opposin
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 24 G. HENDLER. Figure 2. Amphiura ttimpsonii: growth stages of jaw and oral papillae. Stages numbered according to Table I. (A) Stage 2 (brooded); mm dd. 4 AS. (B) Stage 4 (brooded); mm dd. 10 AS; detail of jaw apex, double arrowhead indicates indentation on dental plate at attachment site for (missing) infradental papilla. (C) Stage 4 (free-living); mm dd, 10 AS; opposing arrowheads indicate suture between proximal and distal oral plates of the jaw (sensu Hendler, 1978). (D) Stages 7-8; mmdd, 19 AS; opposing arrow- heads indicate suture between proximal and distal oral plates of the jaw (sensu Hendler, 1978). (E) Adult; mm dd. Abbreviations: a, infradental papilla; b, buccal scale; d, adoral shield spine; dp, dental plate; o, oral plate; s, adoral shield; to, tooth. oral papilla. In the adult (Fig. 2E), a gap separates the buccal scale from the first ventral arm plate and the oral region (initially sealed by the contiguous oral papillae) is incised by five large oral slits (Fig. 1B). Throughout development the dorsal surface of the disk has an irregular arrangement of small scales (Fig. 1C). However, a distinct rosette with a central and five radial primary plates that is characteristic of many ophi- uroids was never seen in A. stimpsonii. Five pairs of ra- dial shields were found in a specimen mm dd with 19 AS (also in a specimen with 15 AS. dd not measured). In individuals about mm dd with 20 AS, the dorsal. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole,
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