. Animate creation : popular edition of "Our living world" : a natural history. Zoology; Zoology. THE APPLE TVN-SHELL. 319 between the two is, that the Magilus, being a fixed shell and inhabiting a stony tunnel, needs not the delicately structured shell required by the active nautilus, and therefore merely fills up the useless portions of the shell with solid matter, requiring no hoUow chambers and no tube of communication. The Spotted Needle-shell, or Spotted Auger, derives its name from the long and sharply pointed form of the shell. More than one hundred species of this genus are
. Animate creation : popular edition of "Our living world" : a natural history. Zoology; Zoology. THE APPLE TVN-SHELL. 319 between the two is, that the Magilus, being a fixed shell and inhabiting a stony tunnel, needs not the delicately structured shell required by the active nautilus, and therefore merely fills up the useless portions of the shell with solid matter, requiring no hoUow chambers and no tube of communication. The Spotted Needle-shell, or Spotted Auger, derives its name from the long and sharply pointed form of the shell. More than one hundred species of this genus are knowTi, all inhabitants of the warmer seas, and the greater part resident within the tropics. In all these shells, the aperture is very small and the canal short. The operculum is small and ^ pointed, having the nucleus at the smaller extremity. In many species the animal is entirely blind; and even in those cases where eyes are present, they are very small, and set at the end of the minute tentacles. The beautiful Spotted Ivory-shell is also a native of the hotter latitudes. Few species, not more than eight or nine in number, are known to exist at the present day. They are all very smooth and polished on the exterior, and their substance is so thick. APPLE TtTN-SHELL.—/)o«iwm pomum. and solid that they seem almost to be made of earthenware. They reside at a moderate depth, being generally found in twelve or fourteen fathoms of water. It is worthy of notice that the rich spotted markings of the shell are repeated upon the body of the animal. The members of this genus possess tolerably large eyes, set at the base of the long tentacles. As in the preceding genus, the operculum has its nucleus at the pointed end. The color of the Spotted Ivory-shell is pure porcelain-white, richly spotted with deep brownish-red, something like the tint known to artists as burnt sienna. It is not a very large shell, being about two inches in length. The two shells represented in this and in the
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Keywords: ., bookauthorbr, bookcentury1800, bookdecade1890, booksubjectzoology
