. Amphioxus and the ancestry of the vertebrates. Amphioxus; Sea squirts; Hemichordata. 84 ANATOMY OF AMPHIOXUS. segment of the body. Dorsal and ventral roots are entirely independent of one another, and at no point do they coa- lesce as they do in the Craniota. In further contrast to cu cna?. Fig. 42 A. — Innervation of tlie region of the oral hood and snout. (After Hatschek, .slightly altered according to the statements of \'.\\ WifHE.) ch. Anterior end of notochord. ci. Buccal cirri, fwi, en-. Fu'st and second cranial nerves with their peripheral ganglia, cu. Rami cutanei dorsales. Left
. Amphioxus and the ancestry of the vertebrates. Amphioxus; Sea squirts; Hemichordata. 84 ANATOMY OF AMPHIOXUS. segment of the body. Dorsal and ventral roots are entirely independent of one another, and at no point do they coa- lesce as they do in the Craniota. In further contrast to cu cna?. Fig. 42 A. — Innervation of tlie region of the oral hood and snout. (After Hatschek, .slightly altered according to the statements of \'.\\ WifHE.) ch. Anterior end of notochord. ci. Buccal cirri, fwi, en-. Fu'st and second cranial nerves with their peripheral ganglia, cu. Rami cutanei dorsales. Left half of oral hood. Right half of oral hood. 0. 01factor\' pit. sf^. sf-. First and second dorsal spinal nerves, so. Sense-organ of oral hood (groove of Hat- schek) indicated as if seen through liod\'-well bv transparency. Z'. \'elum. 1'.//./. Nerve to left side of velum, Nerve to right side of velum. — The septa between the myotomes are indicated by dotted lines. The su()erficial nerves of oral hood are rendered in black; the deeper nerves, which anastomose to form the plexus of Fusari. are left white. the condition met with in the latter there is no ganglionic enlargement on the dorsal 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
