. The elasmobranch fishes. Chondrichthyes. rig. 146. Transverse section through spiracles, ScyUium. (From Eidewood.) dc, dorsal Fig. 147. Horizontal section cutting through the gill pockets to show gill rakers, Squalus sucMii. (H. M. Gilkey, del.) ad., adductor muscle; af., afferent artery; , branchial ray; efc.\ anterior efferent- collector; gr., gill rakers; ia., internal branchial aperture; , interbranchial muscle. ing apparatus which points into the pharynx and completely covers the inter- nal branchial aperture. By means of this strainer small organisms, prevented from p
. The elasmobranch fishes. Chondrichthyes. rig. 146. Transverse section through spiracles, ScyUium. (From Eidewood.) dc, dorsal Fig. 147. Horizontal section cutting through the gill pockets to show gill rakers, Squalus sucMii. (H. M. Gilkey, del.) ad., adductor muscle; af., afferent artery; , branchial ray; efc.\ anterior efferent- collector; gr., gill rakers; ia., internal branchial aperture; , interbranchial muscle. ing apparatus which points into the pharynx and completely covers the inter- nal branchial aperture. By means of this strainer small organisms, prevented from passing out with the respiratory current, are collected in great numbers and passed down the digestive tract as Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Daniel, J. Frank (John Franklin), 1873-1942. Berkeley,Calif. , University of California press
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