By J.G. Blower
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Extra info for Millipedes. Keys and notes for the identification of the species
Diameters are given for the cylindrical species of Chordeuma and Melogona , and for all species of the order JULIO A ; these are the vertical measures from dorsal to ventral poles (conveniently measured horizontally since the partly flexed animals usually rest laterally in the dish) . The diameters given are th ere fore heights which are slightly larger than widths (more markedly so in Cho rdeu ma and Melogona) . See also note on p. 97 . 42 Drawings and Scales All the drawings are interpretive ; stipple is used to indicate shape , by shadow from an upper left top-light , or to darken parts at a deeper focus .
POL YXENIDA (p . 52) Without serrated spines on tergites and pleurites ; setae on trunk , if present , simple . Tergites strongly arched , hiding ventrally placed pleurites and sternites (Fig . 3B , C) or with pleurites incor porated into a pleuro-tergal arch or three-quarter cylinder (Fig. 30 , E , F) , or the sternites may be j oined to the pleurotergal arch to give a completely cylindrical sclerite (Fig. 3A , G , H, I) ; pleurotergites with or without lateral or dorso-lateral expansions 2 or paranota (Fig .
3B , C; 15-18) . . . . . . . . . . . . . . . . . . . . . . . . . Pleuro-tergal arches three-quarter cylinders, with or without lateral or dorso-lateral expansions or paranota giving a sub-trapezoidal appearance (Fig . 3A , D-1) . . . . . . . . . . . . . . . . . . . . . . . . 3 4 3. Twelve tergites , including telson (fewer in young stadia) ; second tergite (shield) much longer than the collum and following tergites ; capable of enrolling into a sphere (Figs .