. Zoology for high schools and colleges. Zoology. Fig. 3861.—Diagram of embiyo Lamprey. •n? br: f-. Fig, 386'.—Diagram of larval Ascidian. Letterineap in Fig. A. m, mouth; i. digestive tract; s/>, spiracles in the pharyngeal portion: ftt heart; e,eye; er, ear; 6r, brain; nc, nervous cord; 6', h", mid-brain; cl, cerebellum; sjtn, spinal nerves; n, notocord; ol, nasal cavity; s, suckers (their homologues also occur in young garpikes and tadpoles). vfhence lateral n-rves pass out. In consequence of a torsion of the axis of the tail, the originally dorsally-placed caudal nerve comes to hav
. Zoology for high schools and colleges. Zoology. Fig. 3861.—Diagram of embiyo Lamprey. •n? br: f-. Fig, 386'.—Diagram of larval Ascidian. Letterineap in Fig. A. m, mouth; i. digestive tract; s/>, spiracles in the pharyngeal portion: ftt heart; e,eye; er, ear; 6r, brain; nc, nervous cord; 6', h", mid-brain; cl, cerebellum; sjtn, spinal nerves; n, notocord; ol, nasal cavity; s, suckers (their homologues also occur in young garpikes and tadpoles). vfhence lateral n-rves pass out. In consequence of a torsion of the axis of the tail, the originally dorsally-placed caudal nerve comes to have a lateral position. The segmentation of the nerve-cord in the tail (as shown by the ganglionic swellings) corresponds to the segmental divisions of the muscles, which recall the myotomes of Amphioxus. The large chorda (nrochord), which extends along the whole length of the tail, constitutes another point of resemblance to ; * Text-book of Zoology, English translation, ii., p. 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York, H. Holt and Company
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