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Contributed by Yale Peabody Museum of Natural History.
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Transcription
Slides examined in Paris
Smitina ___ looked at various
stages of egg development from
initial cleavage stages, follicle stages,
4-cell, 8-cell, 16-cell + also 2-cell.
In ovicell initial "invagination"
differentiation of "internal sac" Note
no digestive tract etc in 3 "genera"
with cyphonate larvae. After
"internal sac" forms this cements to
become the basal wall.
In morula stage you could see
nucleation of cells from crown and
still some syncitial?? cells (ie. cells w/
nuclei but not separate wall membranes)
Eggs do not occur in ovaries. They
can be massed together in funiculus
& display characteristic follicle stage.
In looking at larvae in ovicell,
the pseudopores (in anascans these pores
are called ↓ ) are aligned around
the ovicell & show deeply stained nuclei,
can 8 - this is distinctive of pseudopores.
See Cyclostomata, pores likewise in this
group have a distinctive stain.