Plate VII 



Fig. 36 a and h, Palaemonetes, thirty days. One moult. Optical section of normjil and regener- 

 ating eye. Ventral view, a, Shows regenerating eye; h, normal eye for comparison. Operation 

 apparently removed eye near level of line a-h on normal eye. Regenerating eye shows considerable new 

 tissue and pigment spot on ventral side. Heavy cuticle over end of stump. X 45. 



Fig. 37 Crangon eye stump, thirty-two days. First moult two days after operation; second moult 

 nine days later; third moult sixteen days later. Stump one-third length of normal eye. No regenera- 

 tion. X 45. 



Fig. 38 Crangon, thirty-two days. First moult four days after operation; second moult seventeen 

 days later, a, Optical section of heteromorphic appendage and outline of normal eye. Dorsal view. 

 X 45. h, Ventral view of heteromorphic appendage more highly magnified. Shows six segments and 

 sensory hairs developed on the inner distal edge. Nerve trunk apparent through greater part of length. 

 Appendage measures four-fifths length of normal eye. X 90. 



Fig. 39 Hermit crab, thirty-two days. One moult thirty-two days after operation. Ventral view 

 of stump showing no regeneration. Stump two-thirds length of normal eye. X 45. 



Fig. 40 Crangon eye stump, thirty-one days. First moult seven days after operation; second moult 

 twelve days later. Stump measures one-third length of normal eye. X 45. 



