Town Geology the Lesson of the Philadelphia Rocks
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119 reality only a portion of the internal skeleton, whose position relative to the body of the animal was the same as that of the horny pen of the squid or calamary. At the broken end the guard usually exhibits a conical cavity (alveolus), into which at one time fitted the chambered body (phragmocone), whose upper surface supported the ink-bag. Anteriorly the guard is continued into a " fore-bone " or sheath (pro-ostracum), but this part of the structure, as well as the phragmocone, is but rar...ely met with. ' From such specimens of belemnites as have preserved their soft parts we know that the animal was very closely related to the modern squids, with naked, fleshy bodies, and ten arms, differing from them principally in the characters of the internal skeleton. As in all the existing members of the class, except the nautilus (which has four gills), respiration was effected by a single pair of gills, lodged in a cavity on the posterior side of the body. None of the New Jersey specimens have ever been found in anything like a perfect condition, and not even so much as a trace of the soft parts has as yet been discovered, a circumstance, doubtless, due to the unfavorable condition of the enveloping matrix.
What to read after Town Geology the Lesson of the Philadelphia Rocks?
You can find similar books in the "Read Also" column, or choose other free books by Angelo Heilprin to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
119 reality only a portion of the internal skeleton, whose position relative to the body of the animal was the same as that of the horny pen of the squid or calamary. At the broken end the guard usually exhibits a conical cavity (alveolus), into which at one time fitted the chambered body (phragmocone), whose upper surface supported the ink-bag. Anteriorly the guard is continued into a " fore-bone " or sheath (pro-ostracum), but this part of the structure, as well as the phragmocone, is but rar...ely met with. ' From such specimens of belemnites as have preserved their soft parts we know that the animal was very closely related to the modern squids, with naked, fleshy bodies, and ten arms, differing from them principally in the characters of the internal skeleton. As in all the existing members of the class, except the nautilus (which has four gills), respiration was effected by a single pair of gills, lodged in a cavity on the posterior side of the body. None of the New Jersey specimens have ever been found in anything like a perfect condition, and not even so much as a trace of the soft parts has as yet been discovered, a circumstance, doubtless, due to the unfavorable condition of the enveloping matrix.
What to read after Town Geology the Lesson of the Philadelphia Rocks?
You can find similar books in the "Read Also" column, or choose other free books by Angelo Heilprin to read onlineMoreLess
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