...But the special form of segmentation and layer formation which we find in themammal is by no means the original, simple, palingenetic form... 
Ernst Haeckel 「The Evolution of Man」
...We might call it“equal” or homogeneous segmentation, because the divided cellsretain a resemblance to each other at first (and often until the formation ofthe blastoderm)...
Ernst Haeckel 「The Evolution of Man」
...Although this unequal segmentation of the cyclostoma, ganoids, and amphibiaseems at first sight to differ from the original equal segmentation (forinstance, in the monoxenia, Fig...
Ernst Haeckel 「The Evolution of Man」
...s partitionbetween the primitive gut cavity (N) and the segmentation cavity(F)...
Ernst Haeckel 「The Evolution of Man」
...We can,therefore, reduce this cenogenetic form of the discoid segmentation to thepalingenetic form of the primitive cleavage...
Ernst Haeckel 「The Evolution of Man」
...Theoldest sharks (Cestracion) still have the unequal segmentation inheritedfrom the cyclostoma...
Ernst Haeckel 「The Evolution of Man」
...57—Diagram of discoid segmentation in the bird’sovum (magnified)...
Ernst Haeckel 「The Evolution of Man」
...In order to complete our consideration of the important processes ofsegmentation and gastrulation, we will, in conclusion, cast a brief glance atthe fourth chief type—superficial segmentation...
Ernst Haeckel 「The Evolution of Man」
...Onlythe latter exhibit the important processes of segmentation and gastrulation;and they alone have a primitive gut, and form germinal layers and tissues...
Ernst Haeckel 「The Evolution of Man」
...But to complete our picture wemust also consider the segmentation or metamera-formation of them, which hasyet been hardly noticed, and which is seen best in the longitudinal section...
Ernst Haeckel 「The Evolution of Man」
...In the genealogical treeof the Vertebrates this palingenetic form of segmentation has been preserved inthe Amphioxus alone, all the other Vertebrates having cenogenetically modifiedforms of cleavage...
Ernst Haeckel 「The Evolution of Man」
...Thus the chief advantage in organisation by whichthe earliest Vertebrates took precedence of the unsegmented Chordonia consistedin the development of internal segmentation...
Ernst Haeckel 「The Evolution of Man」
...This segmentation of the muscles wasthe momentous historical process with which vertebration, and the developmentof the vertebrate stem, began...
Ernst Haeckel 「The Evolution of Man」
...From these segmentalmuscle-plates, which are chiefly concerned in the segmentation of theVertebrates, proceed the lateral muscles of the stem, as we find in thesimplest form in the Amphioxus (Fig...
Ernst Haeckel 「The Evolution of Man」
...Out of thisagitation arises a little spot, that is usually round, and enlargesprogressively to reach a maximum, after which it diminishes, withfrequent segmentation and shrinkage...
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
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