Plate IV 



Fig. 20 Palaemonetes, thirty-eight days. First moult ten days after operation; second moult four- 

 teen days later. Ventral view. Entire ommatidial region destroyed. Dark band represents remains 

 of old pigment. Regenerating eye five-eighths length of normal eye. X 45. 



Fig. 21 Hermit crab, sixty-seven days. Moulted twelve days after operation. Stump shows large 

 part of ganglion remaining but no signs of regenerating eye. Loose shreds of new tissue developed distal 

 to the stump. X 45. 



Fig. 22 Palaemonetes, seventeen days. Moulted seventeen days after operation. Eye split. Almost 

 entire eye degenerated. Stump about one-third length of normal eye. X 90. 



Fig. 23 Hermit crab, twenty-one days. Regenerated heteromorphic appendage and base of nor- 

 mal eye. One moult twenty-one days after operation. Appendage segmented; curves inward toward 

 the median line. X 90. 



Fig. 24 Eye stump, thirty-two days. First moult ten days after operation; second moult sixteen 

 days later. Pigment patches near distal end of stump. Short stiff hairs on end of stump. Stump is 

 two-fifths length of normal eye. X 45. 



Fig. 25 Hermit crab. Injured when found. One moult. Ventral view. Distal end of eye shows 

 regenerating ommatidia at o. Abnormal pigment developed at pt. Abnormal protuberance on the 

 inner edge. Injured eye three-fifths length of normal eye. X45. 



