Plate V 



Fig. 9. Lycosa nidicola, same individual as in Figs. 2 and 5. Projection on the transverse plane. 

 The arrow indicates the direction in which the change in the position of the axis of the posterior side 

 eyes took place. The axes of the eyes in the mature spider are represented by light interrupted lines, 

 the maximal angles of vision by common straight lines, while the axes and the maximal angles of vision 

 for the spiderling are represented by heavy dotted lines. 



Fig. 10. This figure shows the respective size of the image on the retina formed by a black square 

 placed at the same distance from each eye in the three species of hunting spiders. If compared with 

 Figs. I, 2 and 3 this figure shows also that the larger eyes form the larger images. 



