Plate VI 



Fig. 32 Palaemonetes, twenty-seven days. First moult sixteen days after operation; second moult 

 ten days later. Outline of normal eye and eye stump showing abnormal pigment. Pigment appears as 

 granular area on inner dorsal surface. Eye stump four-fifths length of normal eye. X 45. 



Fig. 33 Palaemonetes, twenty-seven days. First moult ten days after operation; second moult four- 

 teen days later. Ventral view of stump and normal eye. End of optic nerve stump flush against the 

 cuticle. Optic nerve reduced in size, two-sevenths lengths of normal eye. X 45. 



Fig. 34 Hermit crab, thirty-nine days. Moulted twenty-nine days after operation. Dorsal view 

 of normal eye and heteromorphic appendage. Shows optic squame in connection with appendage. 

 Optic nerve stump extends through proximal half of appendage. X 35. 



Fig. 35 Series of Palaemonetes eye stumps after removal of greater part of eye. a, Eye stump with 

 small quantity of new tissue developed beyond end of optic nerv'e stump. Stump measures one-third 

 length of normal eye. X 45. 6, Eye stump that shows no regeneration. Twenty-nine days. Moulted 

 ten days after operation. One-fourth length of normal eye. X 45. c, Eye stump showing an un- 

 usual development of new tissue. Moulted ten days after operation. Stump two-sevenths length of 

 normal eye. X 45. 



