. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. im Pl ^^ P^f b Irk. prnc Text-figure 112. Text-figure 113. Sections through gills of elasmobranchs, showing afferent and efferent vessels. Text-figure 112. Section across gill-bar of Scyllium canicula, late embryo 32 mm. long, showing blood supply to lamellae. aef, anterior efferent artery; af, afferent artery; al, anterior lamella (filament); b, branchial bar; em, external constrictor muscle; gr, gill-ray; gr% gill-raker; im, adductor branchialis muscle; n, nerve; pef, posterior efferent artery; pl, posterior lamella (fila
. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. im Pl ^^ P^f b Irk. prnc Text-figure 112. Text-figure 113. Sections through gills of elasmobranchs, showing afferent and efferent vessels. Text-figure 112. Section across gill-bar of Scyllium canicula, late embryo 32 mm. long, showing blood supply to lamellae. aef, anterior efferent artery; af, afferent artery; al, anterior lamella (filament); b, branchial bar; em, external constrictor muscle; gr, gill-ray; gr% gill-raker; im, adductor branchialis muscle; n, nerve; pef, posterior efferent artery; pl, posterior lamella (filament) continued into external filament (not present in adult); s, gill-septum. After Goodrich, 1930, Fig. 516. Text-figure 113. Diagram illustrating the structure of a gill of a selachian. aef, anterior efferent artery of arch; af, afferent artery of lamella (filament); al, anterior lamella (fila- ment); gr, gill-ray; Im, capillary network; pef, posterior efferent artery; pl, posterior lamella (filament); prn, pretrematic nerve; prnd, branchial muscle; ptn, post-trematic nerve; s, outer region of septum; sc, superficial constrictor muscle; s\, skeletal arch. After Goodrich, 1930, Fig. 517d. laries. An afferent artery, (af. hr. a. in Text-figure 78), coursing along the outer side of the gill-arch, gives off a branch (afferent branchial arteriole) to each filament. Each afferent arteriole passes along the base of the corresponding filament (Text-figure 78), giving off numerous branches to it (Text-figures 79) and also to the septum. The precise manner of this branching has not been fully worked out, since the task requires an elabo- rate reconstruction, but it is evident that many of the arterioles are here somewhat lacunar in character. An efferent branchial arteriole (ef. hr. a. in Text-figure 78) courses along the outer edge of each filament, returning the blood from the capillaries of the filament to an efi^erent-collector artery of the gill-arch. A fairly large vein, (v. in
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