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factured. An old French naturalist, the Abbe Le Pluche, tells us that "the Pinna with its fleshy tongue" (foot),--a rude inefficient looking implement for work so nice,--"spins such threads as are more valuable than silk itself, and with which the most beautiful stuffs that ever were seen have been made by Sicilian weavers." Gloves made of the byssus of recent Pinnae may be seen in the British Museum. Associated with the numerous Pinnae of Pabba we found a delicately-formed Modiola, a small Ostrya, Plagiostoma, Terebratula, several species of Pectens, a triangular univalve resembling a Trochus, innumerable groups of Serpulae, and the star-like joints of Pentacrinites. The Gryphae are also abundant, occurring in extensive beds; and Belemnites of various species lie as thickly scattered over the rock as if they had been the spindles of a whole kingdom thrown aside in consequence of some such edict framed to put them down as that passed by the father of the Sleeping Beauty. We find, among the detached masses of the beach, specimens of Nautilus, which, though rarely perfect, are sufficiently so to show the peculiarities of the shell; and numerous Ammonites project in relief from almost every weathered plane of the strata. These last shells, in the tract of shore which we examined, are chiefly of one species,--the _Ammonites spinatus_,--one of which, considerably broken, the reader may find figured in Sowerby's "Mineral Conchology," from a specimen brought from Pabba sixteen years ago by Sir R. Murchison. It is difficult to procure specimens tolerably complete. We find bits of outer rings existing as limestone, with every rib sharply preserved, but the rest of the fossil lost in the shale. I succeeded in finding but two specimens that show the inner whorls. They are thickly ribbed; and the chief peculiarity which they exhibit, not so directly indicated by Mr. Sowerby's figure, is, that while the ribs of the outer whorl are broad and deep, as in the _Ammonites obtusus_, they suddenly change their character, and become numerous and narrow in the inner whorls, as in the _Ammonites communis_. The tide began to flow, and we had to quit our explorations, and return to the Betsey. The little wind had become less, and all the canvas we could hang out enabled us to draw but a sluggish furrow. The stern of the Betsey "wrought no buttons" on this occasion; but she had a good tide under her keel; and ere the dinner-hour we had passed th
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