![Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Gill Sac â Outer Duct from Sac Common Opening of Branchial Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Gill Sac â Outer Duct from Sac Common Opening of Branchial](https://c8.alamy.com/comp/RHJRCA/biology-of-the-vertebrates-a-comparative-study-of-man-and-his-animal-allies-vertebrates-vertebrates-anatomy-anatomy-comparative-gill-sac-outer-duct-from-sac-common-opening-of-branchial-ducts-fig-321-diagrams-of-the-heads-of-a-bdellostoma-and-b-myxine-dorsal-views-partly-dissected-to-show-arrangement-of-gills-after-dean-4-elasmobranch-and-holocephalan-gills-gills-of-elasmobranch-fishes-are-lateral-in-position-in-sharks-and-dog-fishes-but-ventral-in-the-flattened-skates-and-rays-they-open-independently-to-the-outside-and-are-separated-from-each-other-not-only-by-skele-RHJRCA.jpg)
Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Gill Sac â Outer Duct from Sac Common Opening of Branchial
![European Honey Bee (Apis Mellifera) with Pollen Sacs Flying Towards a Scentless Mayweed Flower, UK' Photographic Print - Fergus Gill | Art.com European Honey Bee (Apis Mellifera) with Pollen Sacs Flying Towards a Scentless Mayweed Flower, UK' Photographic Print - Fergus Gill | Art.com](https://imgc.artprintimages.com/img/print/fergus-gill-european-honey-bee-apis-mellifera-with-pollen-sacs-flying-towards-a-scentless-mayweed-flower-uk_u-l-q10o48j0.jpg)
European Honey Bee (Apis Mellifera) with Pollen Sacs Flying Towards a Scentless Mayweed Flower, UK' Photographic Print - Fergus Gill | Art.com
![Sinergasilus lieni females without eye sacs attach to the proliferated... | Download Scientific Diagram Sinergasilus lieni females without eye sacs attach to the proliferated... | Download Scientific Diagram](https://www.researchgate.net/publication/8585192/figure/fig1/AS:601760246796332@1520482231762/Sinergasilus-lieni-females-without-eye-sacs-attach-to-the-proliferated-and-fused-gill.png)
Sinergasilus lieni females without eye sacs attach to the proliferated... | Download Scientific Diagram
![Nudibranch - Goniobranchus coi [before Chromodoris coi]. The two pink sausage shaped structures by the gill are the eggs sacs of a parasitic copepod Stock Photo - Alamy Nudibranch - Goniobranchus coi [before Chromodoris coi]. The two pink sausage shaped structures by the gill are the eggs sacs of a parasitic copepod Stock Photo - Alamy](https://l450v.alamy.com/450v/mmbt6m/nudibranch-goniobranchus-coi-before-chromodoris-coi-the-two-pink-sausage-shaped-structures-by-the-gill-are-the-eggs-sacs-of-a-parasitic-copepod-mmbt6m.jpg)
Nudibranch - Goniobranchus coi [before Chromodoris coi]. The two pink sausage shaped structures by the gill are the eggs sacs of a parasitic copepod Stock Photo - Alamy
![sAC in nuclei of leopard shark gill cells. (A) anti-dogfish sAC (dfsAC)... | Download Scientific Diagram sAC in nuclei of leopard shark gill cells. (A) anti-dogfish sAC (dfsAC)... | Download Scientific Diagram](https://www.researchgate.net/publication/312663196/figure/fig2/AS:466307675103235@1488187821945/sAC-in-nuclei-of-leopard-shark-gill-cells-A-anti-dogfish-sAC-dfsAC-antibodies.png)
sAC in nuclei of leopard shark gill cells. (A) anti-dogfish sAC (dfsAC)... | Download Scientific Diagram
![Nudibranch - Goniobranchus coi [before Chromodoris coi]. The two pink sausage shaped structures by the gill are the eggs sacs of a parasitic copepod Stock Photo - Alamy Nudibranch - Goniobranchus coi [before Chromodoris coi]. The two pink sausage shaped structures by the gill are the eggs sacs of a parasitic copepod Stock Photo - Alamy](https://c8.alamy.com/comp/MMBT6N/nudibranch-goniobranchus-coi-before-chromodoris-coi-the-two-pink-sausage-shaped-structures-by-the-gill-are-the-eggs-sacs-of-a-parasitic-copepod-MMBT6N.jpg)