The deutomalæ (gnathochilarium), or second pair of diplopod jaws, are analogous to the labium or second maxillæ of insects, forming a flattened, plate-like under-lip, constituting the floor of the mouth (Fig. 6). This pair of appendages needs farther study, especially in the late embryo, before it can be fully understood. So far as known, judging by Metschnikoff’s work on the embryology of the diplopods, these myriopods seem to have in the embryo but two pairs of post-antennal mouth-parts, which he designated as the “mandibles” and “labium.” Meinert, however, regards as a third pair of mouth-parts or “labium” what in our Fig. 7 is called the internal stipes (_stip. i._), behind which is a triangular plate, _lamina labialis_ (_lam. lab_), which he regards as the sternite of the same segment. [Illustration: FIG. 7.—Deutomala of Julus, the lettering as in Fig. 6. ] [Illustration: FIG. 8.—Head of _Scolopendra_, seen from beneath, showing the “mandible” (protomala) with its cardo (_card._) and stipes (_st._), also the labrum and epilabrum. ] The hypopharynx, our “labiella,” (Fig. 6), with the supporting rods or _stili linguales_ (_sti. l_), of Meinert, are of nearly the same shape as in some insects. Of the clypeus of insects there is apparently no homologue in myriopods, though in certain diplopods there is an interantennal clypeal region. The labium of insects is represented by a short, broad piece, which, however, unlike that of insects, is immovable, and is flanked by a separate piece called the _epilabrum_ (Fig. 8). Vom Rath has observed an epipharynx, which has the same general relations as in insects. [Illustration: FIG. 9.—Larva of Julus: _a_, the 3d abdominal segment, with the new limbs just budding out; _b_, new segments arising between the penultimate and the last segment.—After Newport. ] The embryology of myriopods is in many respects like that of insects. The larva of diplopods hatches with but few segments, and with but three pairs of limbs; but these are not, as in insects, appended to consecutive segments, but in one species the third, and in another, _Julus multistriatus?_ (Fig. 10), the second, segment from the head is footless, while Vom Rath represents the first segment of an European Blaniulus as footless, the feet being situated consecutively on segments 2 to 4. The new segments arise at “the growing point” situated between the last and penultimate segment, growing out in groups of sixes (Newport) or in our _Julus multistriatus?_ in fives (Fig. 10). In adult life diplopods (Julus) have a single pair of limbs on the three first segments, or those corresponding to the thoracic segments of insects, the succeeding segments having two pairs to each segment. [Illustration: FIG. 10.—Freshly hatched larva of _Julus multistriatus?_ 3 mm. long: _a_, 5 pairs of rudimentary legs, one pair to a segment. ]