Figs. 104—9. — Cupulate Eyes of Arthropods. 



Fig. 104. — The frontal stemma of the 

 imago of the blow-fly, Calliphora 

 (after Lowne). 



Fig. 10.5. — Sagittal section of the 

 median anterior ocellus of the 

 jumping spider, Salticus (after Biit- 

 schli). 



DIS 



Fig. 106.— The frontal oceUus of the 

 hover-fly, Helophilus. 



DIS, cells with long sensory ends 

 lying distant from the lens ; Pr, cells 

 with short sensory ends lying proxi- 

 mally to the lens (after Hesse). 



Fig. 107. — The anterior median ocellus 

 of the house spider, Tegenaria domes- 

 tica. 



It is to be noted that the optic nerve 

 fibres, ON, issue from the lateral aspect 

 of the visual cells, R (compare p. 159). 



Fig. 108.— The dorsal ocellus of the 

 insect, Aphrophora spumaria (after 



Fig. 109. — The lateral ocellus of the 

 scorpion (after Lankester and 

 Link). Bourne). 



In Figs. ! ()H-9 the eye is in every sense simple although there is some association of 

 the visual > .• lis around rhabdon>«s. 



Cut, cuticle ; Ep, hypodermal epithelium ; L, cuticular lens ; N, ON, optic nerve 

 fibres ; P, p nent cells ; PS, preretinal space ; R, retinal (visual) cells ; Rd, rods or 

 rhabdites ; i rhabdomes ; V, hypodermal cells forming vitreous. 



