. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 196 BULLETIN OF THE the dorsal median face to tho visceral ganglion (Figs. 103% 112, 113), aiid the anterior face to the cerebral ganglia (Fig. 107). JN'o nerves arise from the pleural ganglia. The visceral ganglia (Plate VIII. Figs. 103% 110-113) have also moved nearer to the median plane. The left ganglion is directly below. Figure G. — Posterior face of a transverse section from an embryo of the seventeenth day. X 60. ab. Abdominal ganglion. art. ce. Cephalic artery. art. pd. Pedal artery. dt. SI. pr. Primary sexua
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 196 BULLETIN OF THE the dorsal median face to tho visceral ganglion (Figs. 103% 112, 113), aiid the anterior face to the cerebral ganglia (Fig. 107). JN'o nerves arise from the pleural ganglia. The visceral ganglia (Plate VIII. Figs. 103% 110-113) have also moved nearer to the median plane. The left ganglion is directly below. Figure G. — Posterior face of a transverse section from an embryo of the seventeenth day. X 60. ab. Abdominal ganglion. art. ce. Cephalic artery. art. pd. Pedal artery. dt. SI. pr. Primary sexual duct. gl. sal. gl pd. hp. mt. Salivary gland. Pedal gland. Liver. Mantle. Nerve. n. pd. Pedal nerve. npk. Nephridial organ. nph. dx Right nephridial organ. o cy. Otocyst. pd. s. Left pedal ganglion. pi. cr. Pericardium. ret. ta. Retractor muscle of right ocular tentacle. ret. ta s. Retractor muscle of left ocular tentacle. vsc. s. Left visceral ganglion. the oesophagus (Fig. Ill and Figure G), since the latter occupies a posi- tion more to the left side of the body than before. The right visceral ganglion still remains larger, and extends farther dorsally than the left (Figs. 103% 111, 112). It is nearer the median plane than in the. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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