. Bulletin. Natural history; Natuurlijke historie. 32 PEABODY MUSEUM BULLETIN 41. Fig. 17. Surface of the posterior periostracum in Spengleria rostrata; scanning electron micrograph. Rodlike structure on the right is a sponge spicule. Fig. 18. Abraded tips of aragonitic periostracal spikes on the sides of the shell in the anterior of Spengleria rostrata. Note the alignment of the spikes in rows oblique to the larger comarginal shell ridges. Fig. 19. Aragonitic periostracal spikes on the anteroventral shell margin oi Spengleria rostrata. Note the apical abrasion. Fig. 20. Acetate peel of a radi
. Bulletin. Natural history; Natuurlijke historie. 32 PEABODY MUSEUM BULLETIN 41. Fig. 17. Surface of the posterior periostracum in Spengleria rostrata; scanning electron micrograph. Rodlike structure on the right is a sponge spicule. Fig. 18. Abraded tips of aragonitic periostracal spikes on the sides of the shell in the anterior of Spengleria rostrata. Note the alignment of the spikes in rows oblique to the larger comarginal shell ridges. Fig. 19. Aragonitic periostracal spikes on the anteroventral shell margin oi Spengleria rostrata. Note the apical abrasion. Fig. 20. Acetate peel of a radial vertical section through the posterior periostracum of Spengleria rostrata. Note the thin outer layer of the organic periostracum pulled away from the tipsof someof the aragonitic periostracal 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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