The Life History of Nucula Delphinodonta Mighels
The Life History of Nucula Delphinodonta Mighels
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The apical plate is thrown away with the test. ( See pp. 26 and 27, and figs, ii and 24. ) Shell. The shell begins to form some time before the test is shed. The prodissoconch has a rounded outline and a short straight hinge-line. The adult shell is very robust. (See pp. 27 and 28, and figs. 20, 36, 50, and 51. ) Mantle. The mantle lobes are formed by the growth and folding of the shell-gland. There are no tentacles on the mar- 66 gins of the mantle, and no siphons are formed. (See p. 29, and f...igs. 8, 17, 20, 48, and 69. ) Foot. The foot is formed by the growth of tissue that, at first, lies between the stomodseum and the gut. At the time the test is shed it is very small and cannot be moved. The side flaps are developed as the result of unequal growth of the ventral side of the foot. The foot is a remarkably good burrowing organ, and it seems never to be used in creeping. (See pp. 30-33, and figs. 25, 28, 34, 36, 39, 40, 41, 48, 49, and 69. ) Byssal Gland. The byssal gland is formed as an invagination on the ventral surface of the foot soon after the test is shed.
What to read after The Life History of Nucula Delphinodonta Mighels?
You can find similar books in the "Read Also" column, or choose other free books by Gilman Arthur Drew to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The apical plate is thrown away with the test. ( See pp. 26 and 27, and figs, ii and 24. ) Shell. The shell begins to form some time before the test is shed. The prodissoconch has a rounded outline and a short straight hinge-line. The adult shell is very robust. (See pp. 27 and 28, and figs. 20, 36, 50, and 51. ) Mantle. The mantle lobes are formed by the growth and folding of the shell-gland. There are no tentacles on the mar- 66 gins of the mantle, and no siphons are formed. (See p. 29, and f...igs. 8, 17, 20, 48, and 69. ) Foot. The foot is formed by the growth of tissue that, at first, lies between the stomodseum and the gut. At the time the test is shed it is very small and cannot be moved. The side flaps are developed as the result of unequal growth of the ventral side of the foot. The foot is a remarkably good burrowing organ, and it seems never to be used in creeping. (See pp. 30-33, and figs. 25, 28, 34, 36, 39, 40, 41, 48, 49, and 69. ) Byssal Gland. The byssal gland is formed as an invagination on the ventral surface of the foot soon after the test is shed.
What to read after The Life History of Nucula Delphinodonta Mighels?
You can find similar books in the "Read Also" column, or choose other free books by Gilman Arthur Drew to read onlineMoreLess
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