. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. yathOphyllvm qitcdiyemimim, Goldf. ; {n, o) Caninia Jlexuosa; (^j) Chcotcteilycopet don. AGES OF N^ 22U such, in particular, as those of the straight, chambered shellscalled Ortl]occratites,some of which are twelve feet in length,[OrtJioccras fusifor^me^ g.) There are also found some of acoiled shape, like the Ammonites of the secondary age, butha
. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. yathOphyllvm qitcdiyemimim, Goldf. ; {n, o) Caninia Jlexuosa; (^j) Chcotcteilycopet don. AGES OF N^ 22U such, in particular, as those of the straight, chambered shellscalled Ortl]occratites,some of which are twelve feet in length,[OrtJioccras fusifor^me^ g.) There are also found some of acoiled shape, like the Ammonites of the secondary age, buthaving less complicated parhUons, (TrocJioIites (nmnonius^d.)The true cuttle-fishes, which are the highest of the class,are not yet found. On the contrary, the Biyozoa, whichhave long been considered as polyps, but which, accordingto all appearances, are mollusks of a very low order, arevery numerous in this epoch. 476. Tiie Articulata of the Palceozoic age are mostlyTrilobites, animals which evidently belong to the lowerorder of the Crustaceans, (Fig. 156.) There is an incom-pleteness and want of development, in the form of theiibody, that strongly reminds us of the embryo among thecrabs. A great many genera have already been Fig. 156. We may consider as belonging to the more extraordinarythe forms here represented, {Harpes^ a; Arges, b; Broriies, c; and Platynotus, d ;) the latter, as well as the Isotelusthe largest of all, being peculiar to the Palseozoic deposit ofthis country. Some others seem more allied to the crusta«eeans of the following ages, but are nevertheless of a veryextraordinary form, as Eurypterus remipes, (e.) There area so found, in the Devonian, some very large class of Worms is represented only by a few Serpulse, 226 GEOLOGICAL SUCCESSION OF ANIMALS. which are marine worms, surrounded by a solid sheath. Theclass of Insects is entirely wanting. 477. The inferiority of the earliest inhabitants of ourearth appears most striking a
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