. An elementary course of practical zoology. Zoology. J. .â sh. ~* so. m. 'â â sm. â Fig. 97.âA, advanced embryo of Anodonta enclosed in the egg-membrane. K, free larva or glochidium. f, byssus ; £: lateral pits ; s. shell; s/t. hooks ; sm, adductor muscle; su, sensory , hairs ; w. ciliated area. (From Korschelt and Heider.)-) nourished, after the manner of parasites (p. 271), by a secretion from the gills of the parent. The dorsal surface of the embryo is soon marked out by the appearance of a deep depression, the shell-gland, which . secretes, in the first place, a single median shell.
. An elementary course of practical zoology. Zoology. J. .â sh. ~* so. m. 'â â sm. â Fig. 97.âA, advanced embryo of Anodonta enclosed in the egg-membrane. K, free larva or glochidium. f, byssus ; £: lateral pits ; s. shell; s/t. hooks ; sm, adductor muscle; su, sensory , hairs ; w. ciliated area. (From Korschelt and Heider.)-) nourished, after the manner of parasites (p. 271), by a secretion from the gills of the parent. The dorsal surface of the embryo is soon marked out by the appearance of a deep depression, the shell-gland, which . secretes, in the first place, a single median shell. This is, however, soon replaced by a bivalved larval shell (Fig. 97, s) of triangular form, the ventral angles being, produced into hooks {sh). The body at the same time becomes cleft from below upwards (a), forming the right and left mantle-lobes. On the ventral surface, between the lobes of the mantle, is. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Parker, William Newton, joint author. London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1900
