Reactions to light in Planaria maculata with special reference to the function and structure of the eyes (1918)
Taliaferro, William Hay, 1895- · Baltimore · leaf 50
cup is filled withthe distal end of numerous retinulae (fig. 2, R.). Thenumber of these retinulae in any given eye has not beenprecisely ascertained but it is approximately two hun-dred. Each retinula consists of three regions— arhabdome, a central highly refractive region, and anuoleus-bearing… … R< >A NA Figure 2. Camera lucida dra^^ing of aof the eye of Planaria inaculata. AITA, nucleus of accessory cell; P,ing visual cells or retinulae, someomitted; R, retinulae; Rh, rhabdthe rhabdome ; M, middle region ofportion of the nucleus-bearing TPi^io(the nucleus as well as the greatergion…
