Figures
Figs. 1-4. All figures semi-diagrammatic.
Fig. 1: Larva showing main organs. Fig. 2: Chordotonal sense organs in anal palp (P), in Fig. 1. Fig. 3: Plan of typical snare. The luminescent organ is on the left, head on right. The runway (RN) leads into the hiding place (HP) on the left. Fig. 4: Plan of recommended arrangement for keeping larvae for observation. Rotten branches are braced together, bark left on, or holes made for hiding places. Glass cover is essential. Rotten branches can be kept damp more easily than new ones, or than stones. Old cement slabs are also good.
Lettering
B, brain; D, culture of fruit flies (Drosophila) in banana; H, head; HO, curved sensillary seta; HP, hiding place; J, jaws; M, mesenteron or stomach; MG, mucus gland; MP, 1, 2, 3, 4 parts of the malpighian tubes, No. 4 (L) being the light organ; N. nerve from chordotonal sense organs; O, oesophagus: OV, oesophageal valve; P, anal papilla; R, rectum; RN, horizontal runway; S, silk gland; SC, cells of chordotonal sense organ; SL, vertical fishing lines with mucus droplets; X, position of nerve ganglion enervating the segment with the light organ.