The Coral Siderastrea Radians And Its Postlarval Development
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LARVA.
Five different colonies of S. Radians were collected in Kingston Harbor, Jamaica, on the 6th of July, many of the polyps of which contained free planulae. Although similar colonies had been obtained from this locality on former occasions, and examined with regard to their fertility, this was the first time that larvae were secured. On a second visit a week later two or three other ripe colonies were collected, and others which on being sectionized were found to contain ova.
On every colo...ny the fertile polyps were in somewhat restricted patches, not all the individuals coming to maturity at the same time. One, two, or three planulae were plainly visible through the nearly transparent tissues of the parent, and were often observed to pass into the tentacles, which thereby became greatly distended, remaining so even when the polyps were retracted. At times the planulae would glide into the lower regions of the polypal cavity, and were then lost to view. While within the parent cavity it was impossible to determine whether the movement of the larvae was, like that of the food particles, dependent upon the ciliary activity of the lining endoderm or was a result of the larva's own activity.
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You can find similar books in the "Read Also" column, or choose other free books by James Edwin Duerden to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
LARVA.
Five different colonies of S. Radians were collected in Kingston Harbor, Jamaica, on the 6th of July, many of the polyps of which contained free planulae. Although similar colonies had been obtained from this locality on former occasions, and examined with regard to their fertility, this was the first time that larvae were secured. On a second visit a week later two or three other ripe colonies were collected, and others which on being sectionized were found to contain ova.
On every colo...ny the fertile polyps were in somewhat restricted patches, not all the individuals coming to maturity at the same time. One, two, or three planulae were plainly visible through the nearly transparent tissues of the parent, and were often observed to pass into the tentacles, which thereby became greatly distended, remaining so even when the polyps were retracted. At times the planulae would glide into the lower regions of the polypal cavity, and were then lost to view. While within the parent cavity it was impossible to determine whether the movement of the larvae was, like that of the food particles, dependent upon the ciliary activity of the lining endoderm or was a result of the larva's own activity.
What to read after The Coral Siderastrea Radians And Its Postlarval Development?
You can find similar books in the "Read Also" column, or choose other free books by James Edwin Duerden to read onlineMoreLess
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