. Animate creation : popular edition of "Our living world" : a natural history. Zoology; Zoology. '•varices. are natives and appear waters near these shells All the Helmet-shells of the tropical seas, to prefer the shallow the coast. Several of are employed by the HELMET-SHELL.—Cassis g/aiica. (Small in the manufacture of cameos, the differently colored lay- ers producing most exquisite ef- fects when cut by a judicious oper- ator. The colors vary greatly in the different species, and some- times there is a slight variation even in different individuals be- longing to the
. Animate creation : popular edition of "Our living world" : a natural history. Zoology; Zoology. '•varices. are natives and appear waters near these shells All the Helmet-shells of the tropical seas, to prefer the shallow the coast. Several of are employed by the HELMET-SHELL.—Cassis g/aiica. (Small in the manufacture of cameos, the differently colored lay- ers producing most exquisite ef- fects when cut by a judicious oper- ator. The colors vary greatly in the different species, and some- times there is a slight variation even in different individuals be- longing to the same species. Cam- eos, for example, that are cut from the Horned Helmet-shell {Cassis cornuca) are white, upon a ground of rich orange; those that are made from the Warty Helmet-shell {Cassis tuherbsa) are white, on deep dark red ; the cameos formed from the shell of the Ruddy Helmet {Cassis rufa) are saffron-yellow on warm orange. Another beautiful species, called the Queen Conch {Cassis madagascariensis), furnishes a white cameo on a claret-colored ground. The next illustration is a dark smooth shell, represented as crawling on the ground, and partially enveloped in the spotted textures of the living creature. This is the Black Olive, so called on account of the jetty blackness of its exterior, and the oval, rounded form, which is not unlike that of the fruit whose name it bears. The genus Oliva is a very large one, comprising more than one hundred species, and found in all the warm and tropical seas. As may be seen by the figure, the mantle is furnished with two large lobes, that nearly meet over the back while the animal is moving, and which throw out certain filamentary pro- jections, that look very like tenacles in the wrong place. The foot is very large—so large, indeed, that the shell is jiartly buried in its soft material—and the eyes are, as may be seen in the figure, placed before the middle of the tenacles. Owing, probably, to the great devel- opment of the
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Keywords: ., bookauthorbr, bookcentury1800, bookdecade1890, booksubjectzoology
