Plate IX 



Fig. 46 Semidiagrammatic section through the top of eye of Cambarus viriHs sixty-two and one- 

 half hours after removal of part of ommatidia. Shows relation of cuticle and protective crust (cr.) 

 Shows broken down tissue excluded by crust also. Below crust is space from which inner tissues have 

 shrunk. Space occupied by coagulated plasma. X 90. 



Fig. 47 Semidiagrammatic section through upper part of eye of Cambarus gracilis showing con- 

 tiguity between regenerated and old cuticle. Also shows broken down tissues excluded by development 

 of cuticle. Eye operated upon by tearing small hole in cornea with needle. X 450. 



Fig. 48 Section from eye shown in Fig. 9. Broad band of new cuticle developed. Few regenerated 

 nuclei present. All the tissue shown below cuticle degenerating remains of old ommatidia. X 1350. 



Fig. 49 Section from eye shown in Fig. 3. Shows new cuticle with no hypodermal cells beneath it. 

 Shows amitotically dividing nuclei. X 1350. 



Fig. 50 Part of section from eye shown in Fig. 3. Section from near edge injured area. Hypoder- 

 mal nuclei much more numerous than in Fig. 51, which is taken from a section near center of injured 

 area. X 600. 



Fig. 51 Section from eye shown in Fig. 3. New cuticle but no well defined hypodermis yet formed 

 beneath cuticle. Granular masses and pigment patches are remains of degenerating ommatidia. X 430. 



