![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
![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
![Comparative anatomy and physiology. Chap. VI.] GILLS OF FISHES, 233 the gill sacs open separately to the exterior, but in the hag the ducts unite and open by a common orifice Comparative anatomy and physiology. Chap. VI.] GILLS OF FISHES, 233 the gill sacs open separately to the exterior, but in the hag the ducts unite and open by a common orifice](https://c8.alamy.com/comp/REFHE7/comparative-anatomy-and-physiology-chap-vi-gills-of-fishes-233-the-gill-sacs-open-separately-to-the-exterior-but-in-the-hag-the-ducts-unite-and-open-by-a-common-orifice-on-either-side-a-similar-modification-obtains-in-the-gnathostomatous-fishes-for-in-the-shark-like-elasmobranchs-sharks-and-rays-each-gill-cleft-is-open-to-the-exterior-while-in-chimsera-and-all-other-fishes-the-clefts-are-covered-over-either-by-a-fold-of-the-skin-merely-or-by-bony-pieces-opercu-luin-so-that-there-is-on-either-side-but-a-single-opening-to-the-exterior-the-gills-when-complete-consist-of-two-f-REFHE7.jpg)
Comparative anatomy and physiology. Chap. VI.] GILLS OF FISHES, 233 the gill sacs open separately to the exterior, but in the hag the ducts unite and open by a common orifice
![pump mechanism: respiratory systems of insects and fish - Students | Britannica Kids | Homework Help pump mechanism: respiratory systems of insects and fish - Students | Britannica Kids | Homework Help](https://cdn.britannica.com/65/62865-004-4A6593F2.gif)
pump mechanism: respiratory systems of insects and fish - Students | Britannica Kids | Homework Help
![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
![Expression patterns of Rhcg1 mRNA on the surface of the yolk sac and... | Download Scientific Diagram Expression patterns of Rhcg1 mRNA on the surface of the yolk sac and... | Download Scientific Diagram](https://www.researchgate.net/publication/6152466/figure/fig2/AS:667207931555849@1536086175484/Expression-patterns-of-Rhcg1-mRNA-on-the-surface-of-the-yolk-sac-and-gill-of-zebrafish.png)