Diagram of anterior extremity of an early embryo of Scolopendra, ventral view; cl, clypeus; lb, labrum; m, mouth; p.a., preantennal appendage; a, antenna; int, premandibular rudiment; mdl, mandible; mx, maxilla; p.g, palpognath; t.g, toxicognath; lg. 1, first pair of walking legs.(Modified from Heymons, Bibl. Zool., 1901, by permission of E. Nägele.)
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