. Annals of Philosophy. 140 Mr. Levi/ on a neio MUieral. [Feb. Siphonaria angulata. Testa convexo conica, angulata radiato- costata; intus fusca. long. 15-10 unc. Parmophorus elegans. Emarginula breviusculas, Sow. Gen. f. 2, certainly not Parmophorus breviusculus of Blainville, as that shell is in the Museum, and is only slightly antiquated. Inter Parmophoros et Emanginulas. Emarginula cristata. Testa convexo-conica, antice costa media cristata ornata. {To be continued.) Article X. An Account of a new Mineral. By M. Levy, MA. in the University of Paris. (To Mr. Children.) DEAR SIR, Through you
. Annals of Philosophy. 140 Mr. Levi/ on a neio MUieral. [Feb. Siphonaria angulata. Testa convexo conica, angulata radiato- costata; intus fusca. long. 15-10 unc. Parmophorus elegans. Emarginula breviusculas, Sow. Gen. f. 2, certainly not Parmophorus breviusculus of Blainville, as that shell is in the Museum, and is only slightly antiquated. Inter Parmophoros et Emanginulas. Emarginula cristata. Testa convexo-conica, antice costa media cristata ornata. {To be continued.) Article X. An Account of a new Mineral. By M. Levy, MA. in the University of Paris. (To Mr. Children.) DEAR SIR, Through your kindness and that of INIr. .Tames Sowerby, I have been enabled to examine some well-defined single crystals of a substance found at Snowdon, which had been classed by some with rutile, by others with sphene, but which certainly differs from both, its forms being derivable from a right rhombic prism, whilst the primitive form of rutile is a square prism, and that of sphene an oblique rhombic prism. The forms of this substance I have observed are represented by figs. 2, 3, and 4, and although I have not drawn the inferior summit, some of the planes which belong to it occur in some of the crystals. They are flattened parallel to the planes A', and some are more than half an inch in breadth and length. They cleave easily in a direction parallel to the plane g', but the face of cleavage is rather dull. All the natural planes are sufliciently brilliant to be Fig.: s/.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original London
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Keywords: ., bookcentury1800, bookdecade182, bookpublisherlondon, bookyear1825
