. Amphioxus and the ancestry of the vertebrates. Amphioxus; Sea squirts; Hemichordata. i6 AATA rOMY OF Fig. 2. — Diagrammatic transverse section through pharyngeal region of female Amphioxus. (After LanKESTER and BOVERI, from R. Hertwig's Lehrbuck d. Zoologie.') at. Atrial cavity, c. Dorsal ccelom, separated from atrial cavity bv the double- layered membrane known as the ligamentum denticulatum. c/i. Notochord. Dorsal spinal nerve, c. Endostyle, below which is the endostylar ccelom con- taining the branchial artery, f. Fin-ray of dorsal fin. _^. Gonadic pouch contain- ing ova.
. Amphioxus and the ancestry of the vertebrates. Amphioxus; Sea squirts; Hemichordata. i6 AATA rOMY OF Fig. 2. — Diagrammatic transverse section through pharyngeal region of female Amphioxus. (After LanKESTER and BOVERI, from R. Hertwig's Lehrbuck d. Zoologie.') at. Atrial cavity, c. Dorsal ccelom, separated from atrial cavity bv the double- layered membrane known as the ligamentum denticulatum. c/i. Notochord. Dorsal spinal nerve, c. Endostyle, below which is the endostylar ccelom con- taining the branchial artery, f. Fin-ray of dorsal fin. _^. Gonadic pouch contain- ing ova. Hepatic vein lying in the narrow ccelomic space which surrounds /, the liver or hepatic coscum. La. Left aorta separated from the right aorta bv the hyperpharyngeal (epibranchial) groove. /v. Lymph-space. 7np. Metapleur. my. Longitudinal muscles of myotomes; over against the dorsal ccelom these muscles are arranged vertically, and form the rectus abdominis of Schneider. Spinal cord. p. Pharynx, r. Excretory tubule, Transverse or subatrial muscles. Ventral (motor) spinal nerve, the fibres of which have the appear- ance of passing directly into the muscle-fibres. The connective tissue (cutis, notochordal sheath, ccelomic epithelium, etc.) is indicated by the black lines. 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 Willey, Arthur, 1867-. New York, London, Macmillan
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1894
