. Chordate morphology. Morphology (Animals); Chordata. length of the gut to the ventral body wall. The other genera of lungfish agree in general with this description. EMBRYOLOGiCAL DEVELOPMENT The early stages of develop- ment of the lungfish (Figure 7-13) are like those of the am- phibian with the exception of the spiral valve, which will be described for the following groups. The liver diverticulum arises early. According to Kerr (1919), one dorsal and right and left ventral pancreatic diverticula appear. The dorsal diverticulum appears first; it is solid in Protoplerus, hollow in Lepidosir
. Chordate morphology. Morphology (Animals); Chordata. length of the gut to the ventral body wall. The other genera of lungfish agree in general with this description. EMBRYOLOGiCAL DEVELOPMENT The early stages of develop- ment of the lungfish (Figure 7-13) are like those of the am- phibian with the exception of the spiral valve, which will be described for the following groups. The liver diverticulum arises early. According to Kerr (1919), one dorsal and right and left ventral pancreatic diverticula appear. The dorsal diverticulum appears first; it is solid in Protoplerus, hollow in Lepidosiren. The ventral anlagen appear somewhat later and the two buds meet to fuse at the midline dorsal to the stem of the liver diverticulum. Still later the fused ventral mass grows upward to fuse with the dorsal mass which grows backward within the gut wall. The three ducts are retained in Protoplerus. In JVeoceralodiis the left ventral bud remains rudimentary, and the dorsal part comes to drain through the duct of the right ventral ventricle small intestine testis > terminal intestine urogenital pore bladder (dashed outline) urogenital pore anus Figure 9-13. Viscera of the salmon. A, ventral view of general mass; B, details of relationships at anterior end of gut; C, ventral view of viscera with fat and lymphoid tissue cleared out; D, section through the ileocolic valve; E, left lateral view of viscera with fat and lymphoid tissues removed. 266 THE VISCERA. 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 Jollie, Malcolm. New York, Reinhold
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