TCD MS 10516 folio 77 recto
[12th October 1916] (c). When circling round the snare, constructing the viscid spiral, I have before recorded that the hind limb is the organ of measurement. It is more easily observed in this larger species that, in circling to the right, the spider measures the distance with tip of its right hind tarsus, and uses the left tarsus to help in fixing the spiral. When circling in the opposite direction, the left tarsus is the organ of measurement, the right the aid to adjustment.
(d). This species (No. 24) finds great difficulty in emitting its viscid spiral. Once it arrives at this stage of snare-architecture its movements become more laboured it cannot circle with the rapidity of other geometrical spiders. At each attachment of the viscid spiral it has to grasp the adhesive filament with its tarsus, slowly draw the sticky line from its own spinnerets,