. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 25G BULLETIN OF THE canals, of which the latter has been more studied and is known to carry a nerve and a water-tube. The outer surface of the arm-bone (Fig. B) pre- sents, above, a hollow (4) in which rests the umbo (1) of the next piece be- yond it; below are two depressions (5) into which fit the knobs (2), and between which is a peg (G) fitting in the socket (3). On each side of the lower edge is a triangular swelling (/â¢), which is the outer wall of the tentacle-socket. Seen from above (Fig. C), the upper longit
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 25G BULLETIN OF THE canals, of which the latter has been more studied and is known to carry a nerve and a water-tube. The outer surface of the arm-bone (Fig. B) pre- sents, above, a hollow (4) in which rests the umbo (1) of the next piece be- yond it; below are two depressions (5) into which fit the knobs (2), and between which is a peg (G) fitting in the socket (3). On each side of the lower edge is a triangular swelling (/â¢), which is the outer wall of the tentacle-socket. Seen from above (Fig. C), the upper longitudinal canal (l') divides the piece in two, leaving on either side an elongated triangular surface on which rest the upper arm-plates. On the outer side may be seen the upper surface of the hollow (4) and the articulating peg below it (6); and within is the upper surface of the articulating umbo (1). A view from below (Fig. D) shows the lower longitudinal canal (/) ; then without is the articulating peg (0) and the two sockets of the tentacles (r); within are the great lower muscle-fields («â ), the two articulating knobs (2), and the socket (3) for the articulating p<:g. (For detailed views see PL VII., Figs. 7-10.) From the way in which 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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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1871
