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 Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

There is no open invagination of an archenteron in the fowl, as in the frog --, the gastrula, like the blastosphere, stage is also masked.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

In such types (e.g., amphioxus) a part of the blastosphere wall is tucked into the rest, and a gastrula formed by this process of invagination.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

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 Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

And so segmentation (= cleavage) proceeds, and, at last, a hollow sphere, the blastosphere (Figure 4) is formed, with a segmentation cavity (s.c.).    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

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 Wordnik.com.  [The Elements of Geology] Reference

This is the blastosphere, shown diagrammatically in Figure 4, and of which an internal view, rather truer to the facts of the case as regards shape, is given as Figure 5.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

PROTOZOA, the blastosphere by some rare forms, and the gastrula in the essential structure of the COELENTERATES, -- the subkingdom to which the fresh-water hydra and the corals belong.    From Wordnik.com.  [The Elements of Geology] Reference

The blastosphere of the frog is like what the blastosphere of amphioxus would be, if the future hypoblast cells were enormously larger through their protoplasm being diluted with yolk.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

At first the cells present the appearance of a bunch of grapes or the grains of a mulberry, the morula stage; the growth proceeds rapidly, a cavity forms itself inside and the blastosphere stage is reached.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 9: Laprade-Mass Liturgy] Reference

We naturally assume, from what we have learnt, that the next stages will be the formation of a hollow blastosphere, invagination, a gastrula forming mesoblast by hollow outgrowths from the archenteron, and so on.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

This stage is shown in section in the lower figure of Figure 1. b.d., the blastoderm, is from this point of view, a part of the ripped and flattened blastosphere, spread out on the yolk; s.c. is the segmentation cavity, and y. the yolk.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

The blastosphere.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference