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The Subclavian Vein. (Figs. 4 and 5.)
In Typhlonarke (Figs. 4 and 5) the pectoral girdle is much modified and the lateral portions are drawn out to form a canal in which certain vessels run, and this has various openings to allow the vessels to pass out and supply the fin. From the fin, the first brachial vein (1.br.) enters an anterior fontanelle (Fig. 5), passes inside the canal, crosses to the median side of the subclavian artery, and finally enters the ductus Cuvieri dorsally. The second brachial
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Figure 5.—A dissection of Typhlonarke from the ventral surface, showing the main arteries and veins. The ventral pharyngeal musculature, the pericardial wall and part of the abdominal muscles are removed and the dissection is deeper on the right side of the animal than on the left. (For explanation of letters see end of paper.)
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vein (2.br.) enters the canal by a posterio-dorsal fontanelle, passes out by a medio-ventral opening and joins the lateral abdominal vein to form the subclavian vein.
In the Stingray (Fig. 4, A) the pectoral fin is supplied by three veins. The first (1.br.) drains directly into the ductus Cuvieri. This vessel passes between the propterygium and mesopterygium and divides into two, the propterygial branch running median to the artery. The second (2.br.) and third (3.br.) brachial veins join the lateral abdominal vein to form the subclavian vein, which enters the ductus Cuvieri laterally. The second vessel passes between the mesopterygium and metapterygium, and the third passes dorsal to the metapterygium.
In R. nasuta (Fig. 4, B) two veins enter the lateral abdominal vein, the anterior one (g.v.) running anterior to the propterygium and draining the gill pouches. The posterior one is the brachial vein which divides into a propterygial and a metapterygial branch to supply the fin. A transverse vessel joins the metapterygial branch to the lateral abdominal vein.