The Shell Book; a Popular Guide to a Knowledge of the Families of Living Mollusks, And An Aid to the Identification of Shells Native And Foreign
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Genus CAECUM, Flam.
The strange development of this mollusk has been recently investigated. " In the young of Caecum the apex is at first spiral but as growth proceeds and the long tube begins to form, a septum is produced at the base of the apex, which soon drops off. Soon afterwards, a second septum forms a little farther down, and a second piece drops off, leaving the shell in the normal cylindrical form of the adult." — Cooke.
Much confusion has been caused by conchologists who classi- fied... members of this genus at different stages of development in widely separate groups because they had no knowledge that such changes of form occur in the life history of the individual.
The Florida Blind Shell (C. Floridanum, Stimps.) is a curved white horn of about thirty-two narrow rounded whorls.
The sinuses are wider than the rings. The posterior end is closed with a septum bearing a sharp point. The mouth is oblique.
Length, i inch.
Habitat. — Cape Hatteras to Florida.
C. pulchellum, Stimps, J of an inch long, brownish, with twenty-five rings and a blunt posterior septum, comes from New Bedford, Mass., and neighbouring beaches.
What to read after The Shell Book; a Popular Guide to a Knowledge of the Families of Living Mollusks, And An Aid to the Identification of Shells Native And Foreign?
You can find similar books in the "Read Also" column, or choose other free books by Rogers, Julia Ellen, B. 1866 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Genus CAECUM, Flam.
The strange development of this mollusk has been recently investigated. " In the young of Caecum the apex is at first spiral but as growth proceeds and the long tube begins to form, a septum is produced at the base of the apex, which soon drops off. Soon afterwards, a second septum forms a little farther down, and a second piece drops off, leaving the shell in the normal cylindrical form of the adult." — Cooke.
Much confusion has been caused by conchologists who classi- fied... members of this genus at different stages of development in widely separate groups because they had no knowledge that such changes of form occur in the life history of the individual.
The Florida Blind Shell (C. Floridanum, Stimps.) is a curved white horn of about thirty-two narrow rounded whorls.
The sinuses are wider than the rings. The posterior end is closed with a septum bearing a sharp point. The mouth is oblique.
Length, i inch.
Habitat. — Cape Hatteras to Florida.
C. pulchellum, Stimps, J of an inch long, brownish, with twenty-five rings and a blunt posterior septum, comes from New Bedford, Mass., and neighbouring beaches.
What to read after The Shell Book; a Popular Guide to a Knowledge of the Families of Living Mollusks, And An Aid to the Identification of Shells Native And Foreign?
You can find similar books in the "Read Also" column, or choose other free books by Rogers, Julia Ellen, B. 1866 to read onlineMoreLess
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