...This mode of making a case or sheathby inversion of a bag is technically called invagination,and is readily seen in new and transparent cells... 
Henry J. Slack 「Marvels of Pond-life」
...These two particular symptoms serveto distinguish this affection from enteritis and invagination of the bowel...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Proctodaeum: the invagination of epiblast that producesthe anus and intestine as far forward as and including malpighiantubes...
John. B. Smith 「Explanation of Terms Used in Entomology」
...A blastula, with wide embryonic cavity (blastocoel,bl), g incipient invagination...
Ernst Haeckel 「The Evolution of Man」
...The gastrula is then formed by invagination, ora kind of turning-up of the edge of the blastoderm...
Ernst Haeckel 「The Evolution of Man」
...” Nevertheless, the gastrula is formed here, as inthe previous cases, by the folding or invagination of the blastula...
Ernst Haeckel 「The Evolution of Man」
...In the middle of its hinder border we have thebeginning of the invagination of the primitive gut(Fig...
Ernst Haeckel 「The Evolution of Man」
...The typicalprocess of invagination, though greatly disguised, can thus be clearly seen inthis case, as Goette and Rauber, and more recently Duval (Fig...
Ernst Haeckel 「The Evolution of Man」
...In these thegastrulation proceeds in two phases, as Semon rightly observes: firstly,formation of the entoderm by cleavage at the centre and further growth at theedge; secondly, invagination...
Ernst Haeckel 「The Evolution of Man」
...This invagination or folding proceeds from the primitive mouth, at the twosides of which (right and left) a couple of pouches are formed...
Ernst Haeckel 「The Evolution of Man」
...Hence before and during invagination there is an increasingdifferentiation of the inner from the outer layer...
Ernst Haeckel 「The Evolution of Man」
...A real gastrula (a simplebell-gastrula) is formed from the blastula by invagination, in the same way asin the amphioxus...
Ernst Haeckel 「The Evolution of Man」
...There is, however, an invagination of the ectoderm at the mouth,which has given rise to a muscular pharynx ( sd)...
Ernst Haeckel 「The Evolution of Man」
...This is done in just the same way as the invagination of the blastula, whichgives rise to the gastrula in the amphioxus (Fig...
Ernst Haeckel 「The Evolution of Man」
...” They may be conceived as largely-developed tubular cutaneousglands, formed by invagination of the cutaneous layer...
Ernst Haeckel 「The Evolution of Man」
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