This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1854 edition. Excerpt: ...points of distinction. The species described by D'Archiac is very much more ventricose, and the umbones are more nearly terminal; the posterior aperture is likewise much more considerable. Besides these there is another large undescribed species found in the upper division of the Inferior Oolite of the Cotteswolds, which resembles more nearly the present species than either of those before mentioned; but it is of thrice the linear dimensions, somewhat more elongated, and the superior border is not concave; the test and ligament, which are very well preserved, enable us to affirm its distinctness both from the Great Oolite species, and from Homomya gracilis, to which perhaps it is still more nearly allied. We possess two specimens, which occurred in the bed of soft shelly Oolite which overlies the Weatherstones: it would, therefore, appear to be very rare. Height, 13 lines; longitudinal diameter, 26 lines; diameter through both the valves, 12 lines. Locality. Minchinhampton Common. Testzi ovato-rfionzboided; umooniéue jrrominentious conipressis; latere antico brevi, compreaso, maryine ejusalcm aubrecto cleclivi,-latere posteriore merlocre elonyato, convewo, maryine truncate,-maryinc carzlinali, subrccto, oblique, cleclivi,-maryine inferiore sinuato; lateribus salco lato saperficiali ab unzbone nzaryinc inferiore prozlacto. Shell ovately rhoniboidal; umbones prominent and compressed; anterior side short, its margin nearly straight, sloping obliquely, and somewhat rostrated at the inferior extremity; posterior side moderately elongated, convex, its margin truncated; hinge border nearly straight, but sloping obliquely downwards; inferior margin sinuated; the sides with a wide and superficial depression directed from the umbones to...
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