. The elasmobranch fishes . Fig. 166. Hypobranchial arteries. A. Mustelus antarcticus. (From T. J. Parker.) B. Mus- telus canis. (From Ferguson.) , anterior lateral (lateral abdominal) artery; , brachial artery; }'*, first and fourth branchial afferent arteries; , coracoid artery; cm., commissural artery; , left coronary artery; posterior coronary; , external carotid; , hyoidean aifereut; )., lateral hypobranchial; , mandibular artery; , median hypobranchial; , nutrient artery; pc, pericardial; , subclavian; , ventral aorta; II
. The elasmobranch fishes . Fig. 166. Hypobranchial arteries. A. Mustelus antarcticus. (From T. J. Parker.) B. Mus- telus canis. (From Ferguson.) , anterior lateral (lateral abdominal) artery; , brachial artery; }'*, first and fourth branchial afferent arteries; , coracoid artery; cm., commissural artery; , left coronary artery; posterior coronary; , external carotid; , hyoidean aifereut; )., lateral hypobranchial; , mandibular artery; , median hypobranchial; , nutrient artery; pc, pericardial; , subclavian; , ventral aorta; III, position of third gill cleft. each gill empties a considerable amount of its blood into the anterior effer- ent-collector of its own gill by similar cross-trunks. These trunks may be numerous as in Heptanchus maculatus, few as in Squalus, or they may be single as in Dasyatis {dr., fig. 162). The circuits made by the efferent-collectors, as we have said, are drained into the dorsal aorta by means of the efferent arteries. These arteries we shall consider after discussing certain branches given off by the efferent-collectors.
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