Plate I 



Fig. I Palaemonetes, seven days. One moult seven days after operation, a, Dorsal view, and h, 

 ventral view. Most of ommatidia removed from ventral side. Pigmented portion appears disorganized. 

 Injured eye measures about four-fifths length of normal eye. X 45. 



Fig. 2 Young Palaemonetes, seven days. One moult seven days after operation. Dorsal view. 

 Eye operated upon by thrusting needle into top of ommatidial portion. Nearly half of the ommatidia 

 destroyed. Injured eye measures about three-fourths length of normal eye. X 45. 



Fig. 3 Paleemonetes, ten days. One moult seven days after operation. Ventral view. Part of 

 ventral ommatidial portion removed. Pigment irregularly scattered throughout ommatidial region. 

 Very few uninjured ommatidia remains. X 45. 



Fig. 4 Palaemonetes eye, nineteen days. One moult eighteen days after the operation. Nearly 

 whole ommatidial portion was removed. Pigment patches remains of old ommatidia. New tissues 

 can be seen arranged in strands on interior edge. X 45. 



Fig. 5 Hermit crab, twenty-five days. Regenerated eye, one moult twenty-four days after opera- 

 tion. At least one section of optic ganglion removed. Regenerated eye five-eighths length of normal 

 eye. X 45. 



Fig. 6 Palaemonetes, thirty days. First moult seven days after operation; second moult twenty- 

 one days later. Ventral view. Whole ommatidial region destroyed. Upper part of regenerated tissue 

 perfectly transparent. Irregular patches of old pigment remains seen in lower part of ommatidial 

 region. Regenerating eye three-fourths length of normal eye. X 45. 



Fig. 7 Crangon, thirty-two days. First moult eighteen days after operation; second moult fourteen 

 days later. Dorsal view. Operation removed upper ommatidial surface. Remains of old pigment 

 apparent. Interior of eye shrunk away from cuticle. Injured eye four-fifths length of normal eye. 

 X 60. 



