Fig. 5. Longitudinal sections through the anterio-lateral retinae of a lycosid (species A). (A) A low-power view of a vertical section showing the positions of type 1 (1) and type 2 (2) receptors and the blind region (bl). Dorsal is up, and ventral down in this figure. Scale bar, 35µm. (B) A higher power view of a horizontal section through the ventral tiered region. The distal (d) and proximal (p) layers are clearly visible, with no continuation of the intermediate segments of the distal layer through the proximal layer. Scale bar, 15µm. (C) Summary of the organization of the retina as seen in longitudinal section, showing the fields of view of each region. The shaded region shows an approximate projection through the nodal point of the lens of the blind region (bl) that divides the fields of view of the type 1 and type 2 receptor regions. VC, vitreous cells; SP, screening pigment; ON, optic nerve.