. Journal of comparative neurology . on from Stage XVI, age 88 hours. The preauditory placode isin this stage a cephalad continuation of the auditory vesicle. The ectodermalthickening in the region of the hyoid contact is shown, continuous posteriorlywith the preauditory placode. In the postauditory region two thickenings arepresent. The more dorsal is associated with the first gill and the more ventralwith the second gill. 2 Stage XVII; age 94 hours; shading and abbreviations as in figure 1. Theauditory vesicle is completely detached fom the ectoderm and the preauditoryplacode. The placode is
. Journal of comparative neurology . on from Stage XVI, age 88 hours. The preauditory placode isin this stage a cephalad continuation of the auditory vesicle. The ectodermalthickening in the region of the hyoid contact is shown, continuous posteriorlywith the preauditory placode. In the postauditory region two thickenings arepresent. The more dorsal is associated with the first gill and the more ventralwith the second gill. 2 Stage XVII; age 94 hours; shading and abbreviations as in figure 1. Theauditory vesicle is completely detached fom the ectoderm and the preauditoryplacode. The placode is quite small and overlaps the auditory vesicle andextends three sections (SOfi) only in front of it. The epibranchial placode ispresent and just dorsal to it lies the primordium of the supra- and infra-orbitallines. In the postauditory region, the first gill thickening is completely detachedfrom the second which extends considerably farther caudad; LATERAL LINE PRJMORDIA IN LEPIDOSTEUS OSSEUS F. L. LAND ACRE AND A. C. CONGER PLATE 1.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmedicine, bookyear191
