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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. 1907 Excerpt:... a great measure the depressions between the various parts, and likewise insinuating themselves amidst the hepatic lobules; they are very irregular in form, some being rounded, others elongated and even produced into points and angles. There are six folds on each side of the branchial sac (PL XXXI, fig. 6); the anterior ones are the shortest, the posterior pair are narrower than the rest and diminish in width downwards. The primary vessels are alternately large and small, and the stomata are long with the small intermediate primary vessels crossing them. The longitudinal rods are rather Fig. 53.--A bi-pinnate tentacular filament of Cynthia squamulosa. Highly magnified. narrow; there are six or seven on the folds and three or four between them. The tentacular filaments are large, vary in size, and are usually simply pinnate (PI. XL, fig. 7), but occasionally show a tendency to become bi-pinnate (fig. 53). The branchial tubercle (PI. XLVIII, fig. 5) is small and forms a simple loop opening upwards. The oral tentacles are minute and are twenty-eight or thirty in number, and compressed a little from back to front. The alimentary tube forms a simple transverse loop, extending almost across the pallial sac, and is pretty equal in calibre throughout; the stomach is elongated and very slightly enlarged, and the rectal portion, which is turned forward, is short and a little reduced in diameter; the margin of the anus is smooth. The liver (PL XXXI, fig. 7, and fig. 52 in text) is well developed, and extends over the left side of the stomach; it is composed of two lobes, one being larger than the other, and is broken up into irregular lobules which are composed of minute dendritic tufts the caecal extremities of which give to the surface of the organ a pimpled appeara...