. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 657. Fig. 658. Figs. 055-658.—Jurassic Cephalopods—Ammonites: 655. Ammonites bifrons. 656. Ammonites margaritanns. 657. Ammonites Jason: a, side view; b, showing suture. 658. Ammonites cor- datiis: a, side view; b, showing suture. portion, and the two extremities the ventral. The evolution of form and structure was in the following order: First the straight OrtJwceras, Ammonite. yfUl So m -&> NautUoids, Orthoceratite. Fig. 659.—Diagram showing Form of the Suture. Position of Siphuncle,

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. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 657. Fig. 658. Figs. 055-658.—Jurassic Cephalopods—Ammonites: 655. Ammonites bifrons. 656. Ammonites margaritanns. 657. Ammonites Jason: a, side view; b, showing suture. 658. Ammonites cor- datiis: a, side view; b, showing suture. portion, and the two extremities the ventral. The evolution of form and structure was in the following order: First the straight OrtJwceras, Ammonite. yfUl So m -&> NautUoids, Orthoceratite. Fig. 659.—Diagram showing Form of the Suture. Position of Siphuncle, and Order of First Appear- ance of Families in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892