. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Fra. 723.—Zaptychius carbonarius. carbonarius, Walcott, 1884, Monogi. [:,ji Geo. Sur., vol. 8, p. 263, Subciu^onif! Fig. 724.—Zonites priscus. ZoNiTEs, Montfort, 1810, Conch, vol. 2, p. 282. [Ety, zone, he coiled shell, closely resembling a having an open umbilicus; tl face is transversely sculptured. Z. algireuB. priscus. Carpenter, 1867, Quar. Joii Soc, vol. 23, p. 331, and Acadian p. 385, Coal Meas. Sys
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Fra. 723.—Zaptychius carbonarius. carbonarius, Walcott, 1884, Monogi. [:,ji Geo. Sur., vol. 8, p. 263, Subciu^onif! Fig. 724.—Zonites priscus. ZoNiTEs, Montfort, 1810, Conch, vol. 2, p. 282. [Ety, zone, he coiled shell, closely resembling a having an open umbilicus; tl face is transversely sculptured. Z. algireuB. priscus. Carpenter, 1867, Quar. Joii Soc, vol. 23, p. 331, and Acadian p. 385, Coal Meas. Syst., k ilelix, II' sur- Tyjie r. (leo, < ieol., •o4o«' CLASS CEPHALOPODA [Ety. kephaky head; pons, foot.] The animals of this class are all marine, and they . oach a higher state of an- imal development than any other marine group amoug the MoUusca. Some of them have a rudimentary, cartilaginous, cephalic skeleton, which indicates superi- ority over other marine Mollusca. The locomotive organs consist of arms sun-ouud- ing the head, furnished with sucking cups that take a firm hold on other olijects, Many have fins, and all can pi'opel themselves by the forcible expulsion of water from the respiratory chamber. They swim rapidly, creep on the bottom of the .sea, and are very predatory in their habits. The body is short, thick, and symiiictiical, with branchiae on both sides. The Palaeozoic fossils of this Class belong to the Order Tetrabranchiata (four- gilled), which is represented in tropical seas by the Nautilus. The shells are straight, as in the famih- ' rthoceratidae; curved, as in Cyrtoceratidaj; discoid, as in the Gyroceratidae and Trocholitidae; spiral, as in the Trochoceratidae; involute, as in the Nautilidae; or involute and having lobed sutures, as in the Goniatitida?. In- ternally the shell is divided into numerous chambers by partitions, or sepfa, the animal inhabiting the last chamber, and retaining connection through the preeed- ing chambers by a
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