. The Cambridge natural history. Zoology. 3i8 FISHES of the abdomen, immediately external to the peritoneum (Fig. 187). Each vein begins near the pelvic fin, where it is con- nected with its fellow across the dorsal face of the ischio-pubic cartilage, and thence runs forward towards the pectoral fin. At its origin the lateral vein receives a femoral vein from the pelvic fin and a cloacal vein, and also, near its anterior end, a brachial vein from the pectoral fin, finally joining the Cuvierian duct of its side.^ The anterior cardinal vein is situated directly above the gill- arches of its side
. The Cambridge natural history. Zoology. 3i8 FISHES of the abdomen, immediately external to the peritoneum (Fig. 187). Each vein begins near the pelvic fin, where it is con- nected with its fellow across the dorsal face of the ischio-pubic cartilage, and thence runs forward towards the pectoral fin. At its origin the lateral vein receives a femoral vein from the pelvic fin and a cloacal vein, and also, near its anterior end, a brachial vein from the pectoral fin, finally joining the Cuvierian duct of its side.^ The anterior cardinal vein is situated directly above the gill- arches of its side of the head, and extends forwards from its junction behind with the Cuvierian duct to the outer side of the cicxr. d,XL. spTf. âV-. Fig. 187.âDiagrammatic trans- verse section of au Elasmo- branch, sliowing tlie position of tlie principal longitudinal blood-vessels, c', Coelom; , dorsal aorta ; , dorsal cntaneoiis vein ; ^ dorsal intestinal vein ; i, intestine ; ^ internal in- testinal vein ; ^ lateral cutaneous vein ; ^ lateral vein ; , myelonic vein and artery ; , posterior cardinal vein ; ^ spinal cord ; , spiral valve; v, vertebral centrum ; , ventral cutaneous vein ; x^LT", Y , ventral intestinal vein. ^-â '^^- ' (From T. J. Parlier.) auditory capsule, where it communicates by a valvular orifice with a large sinus surrounding the eye-muscles (orbital sinus), and ventrally, by means of a similar aperture, with another large sinus, the hyoidean sinus, which lies on the outer face of the corresponding by old arch, and is continuous ventrally with its, fellow of the opposite side. Into the orbital sinus open the anterior facial vein from the anterior and external regions of the head, and the anterior cerebral vein from the lateral half of the brain, and, into the hyoidean sinus, the nutrient veins from the hyoidean hemibranch. The inferior jugular veins are situated beneath the branchial apparatus. Each vein begins a
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
