File:EB1911 Mollusca - Development of Limnaeus stagnalis.jpg

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Summary

Description
English: Development of the Pond-Snail, Limnaeus stagnalis (see legend below).
Date published 1911
Source “Mollusca,” Encyclopædia Britannica (11th ed.), v. 18, 1911, p. 673, fig. 2.
Author Edwin Ray Lankester
Permission
(Reusing this file)
Public domain This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.
English: Legend:
r, Directive corpuscle.
bl, Blastopore.
en, Endoderm or enteric cell layer.
ec, Ectoderm or deric cell-layer.
v, Velum.
m, Mouth.
f, Foot.
t, Tentacles.
fp, Pore in the foot (belonging

to the pedal gland?).

mf, The mantle-flap or limbus

pallialis.

sh, The shell.
l, The sub-pallial space, here destined to become the lung.
A, First four cells resulting from the cleavage of the original egg-cell.
B, Side-view of the same.
C, Diblastula stage showing the two cell-layers and the blastopore.
D, E, F,  Trochosphere stage, D older than E or F.
G, Three-quarter view of a Diblastula, to show the orifice of invagination of the endoderm or blastopore, (bl).
H, I, Veliger stage later than D.

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current21:49, 17 February 2019Thumbnail for version as of 21:49, 17 February 2019741 × 949 (163 KB)Library Guy{{Information |description ={{en|1=Development of the Pond-Snail, ''Limnaeus stagnalis'' (see legend below).}} |date =published 1911 |source =“Mollusca,” Encyclopædia Britannica (11th ed.), v. 18, 1911, p. 672, fig. 2. |author =Edwin Ray Lankester |permission ={{PD-Britannica}} }} {{en|Legend:}} {| |-valign="top" |''r'',||Directive corpuscle. |- |''bl'',||Blastopore. |-valign="top" |''en'',||Endoderm or enteric cell layer. |-valign="top" |''ec'',||Ectoderm or der...

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