File:EB1911 Mollusca - Development of Limnaeus stagnalis.jpg
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[edit]DescriptionEB1911 Mollusca - Development of Limnaeus stagnalis.jpg |
English: Development of the Pond-Snail, Limnaeus stagnalis (see legend below). |
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Date | published 1911 | ||||
Source | “Mollusca,” Encyclopædia Britannica (11th ed.), v. 18, 1911, p. 673, fig. 2. | ||||
Author | Edwin Ray Lankester | ||||
Permission (Reusing this file) |
|
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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current | 21:49, 17 February 2019 | ![]() | 741 × 949 (163 KB) | Library Guy (talk | contribs) | {{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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