According to Wulfert  the primitive germ-cells of Gonothyraea can be distinguished soon after the fixation of the planula, appearing amongst the interstitial cells of the ectoderm.
Wulfert, " Die Embryonalentwickelung von Gonothyraea loveni Allm.," Zeitschr.
Quilters Spirit - Antique Quilts to Art Quilting Blog, by Kimberly Wulfert, PhD offers interesting and informative information on antique and vintage quilts.
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