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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 edition. Excerpt:...sections prepared for the microscope, and I find that the shell structure in question is entirely laminar, with a complete absence of tubular structure. This accords well with what we know of that in Isocardia itself, from the researches of the late Dr. W. B. Carpenter.3 1 Report U. S. (ieol. Survey Territories (Haydens), 1876, IX, p. 148, figs. 9-11. 'Mon. U. S. Geol. Survey "(Powell's), lN8r, IX, t. 19, f. 10. » Brit. Assoc. Report for 1844 (1845), Pt. 2, p. 102. Eissilunula Clarkei, Moore, sp. (PI. VI, Pig. 3; PL IX, Pig. 1; PI. X, Figs. 1 and 2; PL XI, Pigs. 1 and 2.) Cytherea Clarkei, Moore, Quart. Journ. Geol. Soc., 1870, XXVI, p. 250, t. 13, f. 1. Cyprina expansa, Etheridge, Quart. Journ. Geol. Soc., 1872, XXVIII, p. 338, t. 19, f. 1. Cytherea Clarkei, Eth. fi., Cat. Austr. Foss., 1878, p. 108. Cyprina expansa Eth. fil., Cat. Austr. Foss., 1878, p. 108. Cytherea Clarkei, Tate, Proc. Austr. Assoc. Adv. Sci. for 1888 (1889), I, p. 230. Cyprina Clarkei, Eth. fil., Geol. Pal. Q'land., &c., 1892, pp. 474 and 568, t. 26, f. 18 and 19, t. 27, f. 9 and 11 (? f. 10). Sp. Chars.---Shell ovate-trapeziform, inflated and very inequilateral. Cardinal margins convex throughout; ventral margins fully rounded. Anterior ends protuberant and compressed; posterior ends at first tumid, but gradually losing their tumidity towards the posterior margins, which are rounded. Umbonal regions high, prominent; anterior slopes short and concave, but without diagonal ridges; posterior slopes long, flattened, and with inconspicuous diagonal ridges. Anterior adductor scars less marked than the posterior, irregularly oval; anterior pedal scars small, immediately above the adductors; posterior adductor scars longitudinally oval. Pallial sinuses remarkably...