Usage examples (13)

• 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.
• There is no open invagination of an archenteron in the fowl, as in the frog --, the gastrula, like the blastosphere, stage is also masked.
• 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.
• 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.