Plate V – Onchocerca gibsoni – Figure 19 Later development stage of larva. 1/12 oil immersion Occular 4; Figure 20 Ditto, Apochromat 2mm Occular 2; Figure 21 Fully developed larva; Figure 22 Head end of fully developed larva, (n) nerve spot, (e) excretory cell. Apochromat 2mm Occular 8. By Gladys Roberts, Institute of Tropical Medicine, Townsville, 1911.