1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
FIG. 42. — So-called " trilobite stage " of Limulus polypkemus. A, Dorsal; B, ventral view. (From KoncMt and Heider. after Leuckart.) Peripatus, Diplopoda, Hexapoda and Chilopoda. Probably tracheae have developed independently by the same process in several groups of tracheate Arachnids. The nomomeristic Arachnids comprise two sub-classes—one a very small degenerate offshoot from early ancestors; the other, the great bulk of the class. Sub- Class L (of the Nomomeristica). PANTO PODA.— Nomomeristic Arachnids, in whi…
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- Vol. 2, pp. 301-301