File:EB1911-Gastropoda 26.png
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| Description |
English: Development of the River-Snail, Paludina vivipara. (After Lankester, 17.)
dc, Directive corpuscle (outcast cell). ae, Arch-enteron or cavity lined by the enteric cell-layer or endoderm. bl, Blastopore. vr, Velum or circlet of ciliated cells. dv, Velar area or cephalic dome. sm, Site of the as yet unformed mouth. f, Foot. mes, Rudiments of the skeleto-trophic tissues. pi, The pedicle of invagination, the future rectum. shgl, The primitive shell-sac or shell-gland. m, Mouth. an, Anus. |
| Date | |
| Source | Encyclopædia Britannica Eleventh Edition, Vol. 11 "Gastropoda". |
| Author | Encyclopædia Britannica |
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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. |  |
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| current | 03:50, 15 March 2015 | | 917 × 1,281 (319 KB) | Animalparty (talk | contribs) | User created page with UploadWizard |
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