Conklin’s interpretations of his own sections and the figures of others appear to have been chiefly based on his own preconceptions. In his ascidian paper (1905a), before obtaining any lancelet embryos. Conklin had concluded from van der Stricht (1896) that lancelet egg must undergo ooplassmic segregation as in ascidians. Subsequently Conklin interpreted all the evidence to support his ideas, First, he erroneously inferred from Sobotta (1897), who illustrated vesicles in the egg cortex, that the cortex . like that of ascidian egg, contained not cortical granules, but numerous mitochondria. On the contrary. TEM has demonstrated that the cortex of lancelet egg is packed with cortical granules and is nearly free of mitochondria (Holland and Holland. 1989a).