Plate II 



Fig. 3. Heteropoda venatoria, adult female. Same .projection as in the two preceding figures. 



Fig. 4. Phidippus tripunctatus, same adult female as in Fig. i. The upper part of the figure shows 

 the projection of the eye-group on the plane of symmetry while the lower part represents the projection 

 of the left half of the eye-group on the horizontal plane. In the same figure the axes and the maximal 

 angles of vision of the spiderling are indicated by heavy dotted lines and the direction in which 

 the change frorn the spiderling to the adult takes place is shown by the arrows. 



