![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
![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
![Gill Sac à Dos pour Le Sac à Dos Race Team 35L Capacité de 35 litres Graphite - Respirant Imperméable Imperméable : Amazon.fr: Sports et Loisirs Gill Sac à Dos pour Le Sac à Dos Race Team 35L Capacité de 35 litres Graphite - Respirant Imperméable Imperméable : Amazon.fr: Sports et Loisirs](https://m.media-amazon.com/images/I/61KKmYpK-vL._AC_UF1000,1000_QL80_.jpg)
Gill Sac à Dos pour Le Sac à Dos Race Team 35L Capacité de 35 litres Graphite - Respirant Imperméable Imperméable : Amazon.fr: Sports et Loisirs
![On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. CirculatiDg and respiratory organs, LepiUusin;li 313 314 Two gill-sacs, SdcUo- stoma. Two gill-sacs, Lamprey 313, m, to be split through its plane, On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. CirculatiDg and respiratory organs, LepiUusin;li 313 314 Two gill-sacs, SdcUo- stoma. Two gill-sacs, Lamprey 313, m, to be split through its plane,](https://c8.alamy.com/comp/PG2HW6/on-the-anatomy-of-vertebrates-vertebrates-anatomy-comparative-1866-circulatidg-and-respiratory-organs-lepiuusinli-313-314-two-gill-sacs-sdcuo-stoma-two-gill-sacs-lamprey-313-m-to-be-split-through-its-plane-and-each-half-to-be-glued-by-its-outer-smooth-side-to-an-intermediate-septum-which-would-then-support-the-opposite-halves-of-two-distinct-sacs-and-expose-their-vascular-mucous-surface-to-view-if-the-septum-be-attached-by-xx-vol-ii-p-39-prep-no-910-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readabi-PG2HW6.jpg)
On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. CirculatiDg and respiratory organs, LepiUusin;li 313 314 Two gill-sacs, SdcUo- stoma. Two gill-sacs, Lamprey 313, m, to be split through its plane,
![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
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