. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. LAET LAI 3b I Development of Cytherea deshayesiana. (After Bernard.). when they are formed by thickenings on its upper surface. They can only be more or less internal or external with regard to each other. Thirdly. According to Bernard^s hypothesis, the lamellae are derived from radial internal ribs, which, except for inter- calation (which only occurs in later shell-development), remain constant in number and normally develop simul- taneously. Such ribs cannot be regarded as
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. LAET LAI 3b I Development of Cytherea deshayesiana. (After Bernard.). when they are formed by thickenings on its upper surface. They can only be more or less internal or external with regard to each other. Thirdly. According to Bernard^s hypothesis, the lamellae are derived from radial internal ribs, which, except for inter- calation (which only occurs in later shell-development), remain constant in number and normally develop simul- taneously. Such ribs cannot be regarded as dorsal or ventral with regard to each 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 London, Taylor and Francis, Ltd
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