This historic book may have numerous typos and missing text.
Purchasers can usually download a free scanned copy of the original
book (without typos) from the publisher. Not indexed. Not
illustrated. 1921 edition. Excerpt: ...to the brachiopod Chonetes
sarcinulatus. From Stadtfeld. Fig. 37. The tube Hicetes overgrown
by polyp-cells of different series. Fig. 38. An etching of the
coral showing an actual attachment of the worm tube to the
snail-shell Loxonema. Fig. 39. Vertical section of a coral showing
the worm tube entrenched between the polyp-cells. Fig. 40. An
almost unique illustration of the attachment of the American
Pleurodictyum to the brachiopod Chonetes eoronatus. ent coral. In
many cases, such as that illustrated in figure 38, the worm tube is
directly fixed to the gastropod; again it may be free of the
gastropod and separated from it by the thickened basal covering or
epitheca of the coral. With the multiplication of cell growth and
the upward trend of the coral, the worm began its convoluted
growth, its tube growing as much at one end as at the other and
with the same curvature at each end. Many of the existing
tubicolous as well as the boring worms have their tubes open at
both ends. In view of the regularity of coiling shown in some of
the commensal worm tubes it is interesting to notice that in this
case the worm, after making a start, gets its double coil into
parallelism for from one-half to an entire turn and then each arm
starts off into a direct course outward and upward following the
radial path of the coral cells. These tubes often pass in and out
between the cells, shut off from them by secretions of the coral
substance, keeping their extremities always at the tentacular
surface, and very seldom is there evidence of the worm encroaching
on the polypite cells. Still this may occur and the worm tube
occasionally becomes encased by a young polypite and holds a
position in the center of the cell. Not always does the growth of
|Country of origin:
New York State Museum
||246 x 189 x 2mm (L x W x T)
||Paperback - Trade
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