CHLOEOPHYLL CORPUSCLES OF SOME INFUSOKIA. 169 



margins of the corpuscles^ iu part hidden from view by numerous 

 amylaceous bodies ; and I have founds with careful pressure^ 

 corpuscles passing out from the endoplasm. This might be 

 due to the fact that division was already beginning in the 

 protoplasm ; but the corpuscles cannot result from the breaking 

 up of the entire coloured endoplasm, because when formed 

 they are surrounded by colourless granular protoplasm. At 

 most the chlorophyll could only be diffused in the layer imme- 

 diately beneath the cuticle. The fact that the corpuscles agree 

 in structure with the typical form, and that they are present 

 in young Euglenee, seems to make it improbable that they are 

 formed as a preliminary to division, though they may originally 

 have been so formed. 



The corpuscles iu all these animals have the same structure 

 as those of Spongilla and Hydra viridis. The existence of a 

 colourless and green layer appears characteristic of the animal 

 chlorophyll corpuscle. 



If the function of the chlorophyll in animals is the same as 

 that ascribed to it in plants by Professor Priugsheim, the dis- 

 position of the chlorophyll in the animal corpuscle is better 

 adapted to shelter the central colourless protoplasm than that 

 of the substance of the cell. So the greater saving of 

 oxidisable material should take place in the corpuscle itself. 

 I have tested the animals examined with iodine, but have found 

 no trace of starch in the corpuscle or in the endoplasm. 

 Bright transparent bodies are not infrequently present in the 

 corpuscles, but I have not ascertained their nature. 



DESCRIPTION OF PLATES XIII and XIV 



Illustrating Miss Jessie A. Sallitt's Paper on ''The Chlorophyl. 

 Corpuscles of Infusoria.'^ 



Figs. 1 to 5. — Chlorophyll corpuscles of Paramecium bursaria. 

 1. — Group of corpuscles. 



2. — Corpuscles dividing, a. Series showing gradual division. 

 h, c, d. Different views of the same corpuscles. 



