blastosphere
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If we compare this with the typical blastosphere of the lower type, we see that it is, as it were, flattened out on the yolk.
From Text Book of Biology, Part 1: Vertebrata by H. G. (Herbert George) Wells
Both the blastosphere and gastrula often swim freely by flagella.
From The Whence and the Whither of Man A Brief History of His Origin and Development through Conformity to Environment; Being the Morse Lectures of 1895 by John Mason Tyler
In this process a portion of the blastosphere wall is the tucked into the rest, as indicated by the arrow, so that a two-layered sack is formed.
From Text Book of Biology, Part 1: Vertebrata by H. G. (Herbert George) Wells
The central part of the blastosphere is called the segmentation cavity or blastocoel.
From Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" by Various
The earliest one-celled protozoa were probably succeeded by many- celled animals of the type of the blastosphere, and these by gastrula-like organisms.
From The Elements of Geology by William Harmon Norton
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